diff --git a/question/engine/lib.php b/question/engine/lib.php
index b65ce4b9c24..93dffb26507 100644
--- a/question/engine/lib.php
+++ b/question/engine/lib.php
@@ -905,6 +905,47 @@ abstract class question_utils {
                 self::$tens[$number / 10 % 10] . self::$units[$number % 10];
     }
 
+    /**
+     * Convert an integer to a letter of alphabet.
+     * @param int $number an integer between 1 and 26 inclusive.
+     * Anything else will throw an exception.
+     * @return string the number converted to upper case letter of alphabet.
+     */
+    public static function int_to_letter($number) {
+        $alphabet = [
+                '1' => 'A',
+                '2' => 'B',
+                '3' => 'C',
+                '4' => 'D',
+                '5' => 'E',
+                '6' => 'F',
+                '7' => 'G',
+                '8' => 'H',
+                '9' => 'I',
+                '10' => 'J',
+                '11' => 'K',
+                '12' => 'L',
+                '13' => 'M',
+                '14' => 'N',
+                '15' => 'O',
+                '16' => 'P',
+                '17' => 'Q',
+                '18' => 'R',
+                '19' => 'S',
+                '20' => 'T',
+                '21' => 'U',
+                '22' => 'V',
+                '23' => 'W',
+                '24' => 'X',
+                '25' => 'Y',
+                '26' => 'Z'
+        ];
+        if (!is_integer($number) || $number < 1 || $number > count($alphabet)) {
+            throw new coding_exception('Only integers between 1 and 26 can be converted to letters.', $number);
+        }
+        return $alphabet[$number];
+    }
+
     /**
      * Typically, $mark will have come from optional_param($name, null, PARAM_RAW_TRIMMED).
      * This method copes with:
diff --git a/question/engine/tests/questionutils_test.php b/question/engine/tests/questionutils_test.php
index b9db0ece675..e60960164f4 100644
--- a/question/engine/tests/questionutils_test.php
+++ b/question/engine/tests/questionutils_test.php
@@ -177,6 +177,35 @@ class question_utils_test extends advanced_testcase {
         $this->assertSame('mmmcmxcix', question_utils::int_to_roman(3999));
     }
 
+    public function test_int_to_letter() {
+        $this->assertEquals('A', question_utils::int_to_letter(1));
+        $this->assertEquals('B', question_utils::int_to_letter(2));
+        $this->assertEquals('C', question_utils::int_to_letter(3));
+        $this->assertEquals('D', question_utils::int_to_letter(4));
+        $this->assertEquals('E', question_utils::int_to_letter(5));
+        $this->assertEquals('F', question_utils::int_to_letter(6));
+        $this->assertEquals('G', question_utils::int_to_letter(7));
+        $this->assertEquals('H', question_utils::int_to_letter(8));
+        $this->assertEquals('I', question_utils::int_to_letter(9));
+        $this->assertEquals('J', question_utils::int_to_letter(10));
+        $this->assertEquals('K', question_utils::int_to_letter(11));
+        $this->assertEquals('L', question_utils::int_to_letter(12));
+        $this->assertEquals('M', question_utils::int_to_letter(13));
+        $this->assertEquals('N', question_utils::int_to_letter(14));
+        $this->assertEquals('O', question_utils::int_to_letter(15));
+        $this->assertEquals('P', question_utils::int_to_letter(16));
+        $this->assertEquals('Q', question_utils::int_to_letter(17));
+        $this->assertEquals('R', question_utils::int_to_letter(18));
+        $this->assertEquals('S', question_utils::int_to_letter(19));
+        $this->assertEquals('T', question_utils::int_to_letter(20));
+        $this->assertEquals('U', question_utils::int_to_letter(21));
+        $this->assertEquals('V', question_utils::int_to_letter(22));
+        $this->assertEquals('W', question_utils::int_to_letter(23));
+        $this->assertEquals('X', question_utils::int_to_letter(24));
+        $this->assertEquals('Y', question_utils::int_to_letter(25));
+        $this->assertEquals('Z', question_utils::int_to_letter(26));
+    }
+
     /**
      * @expectedException moodle_exception
      */
diff --git a/question/type/ddimageortext/edit_ddimageortext_form.php b/question/type/ddimageortext/edit_ddimageortext_form.php
index 63d4c710e4f..b564f44143b 100644
--- a/question/type/ddimageortext/edit_ddimageortext_form.php
+++ b/question/type/ddimageortext/edit_ddimageortext_form.php
@@ -147,7 +147,7 @@ class qtype_ddimageortext_edit_form extends qtype_ddtoimage_edit_form_base {
                                             array('class' => 'dragitemtype'));
         $options = array();
         for ($i = 1; $i <= self::MAX_GROUPS; $i += 1) {
-            $options[$i] = $i;
+            $options[$i] = question_utils::int_to_letter($i);
         }
         $grouparray[] = $mform->createElement('select', 'draggroup',
                                                 get_string('group', 'qtype_gapselect'),
diff --git a/question/type/ddwtos/tests/behat/edit.feature b/question/type/ddwtos/tests/behat/edit.feature
index b0557e96a70..288830234bb 100644
--- a/question/type/ddwtos/tests/behat/edit.feature
+++ b/question/type/ddwtos/tests/behat/edit.feature
@@ -27,6 +27,9 @@ Feature: Test editing a drag and drop into text questions
   @javascript
   Scenario: Edit a drag and drop into text question
     When I click on "Edit" "link" in the "Drag to text" "table_row"
+    Then I should see "Choice [[1]]"
+    And I should see "Choice [[2]]"
+    And I should see "Choice [[3]]"
     And I set the following fields to these values:
       | Question name | Edited question name |
     And I press "id_submitbutton"
diff --git a/question/type/gapselect/edit_form_base.php b/question/type/gapselect/edit_form_base.php
index fa99533ef47..72b460061a0 100644
--- a/question/type/gapselect/edit_form_base.php
+++ b/question/type/gapselect/edit_form_base.php
@@ -182,7 +182,7 @@ class qtype_gapselect_edit_form_base extends question_edit_form {
     protected function choice_group($mform) {
         $options = array();
         for ($i = 1; $i <= $this->get_maximum_choice_group_number(); $i += 1) {
-            $options[$i] = $i;
+            $options[$i] = question_utils::int_to_letter($i);
         }
         $grouparray = array();
         $grouparray[] = $mform->createElement('text', 'answer',
diff --git a/question/type/gapselect/lang/en/qtype_gapselect.php b/question/type/gapselect/lang/en/qtype_gapselect.php
index c743a0eeb62..94852405041 100644
--- a/question/type/gapselect/lang/en/qtype_gapselect.php
+++ b/question/type/gapselect/lang/en/qtype_gapselect.php
@@ -25,7 +25,7 @@
 $string['addmorechoiceblanks'] = 'Blanks for {no} more choices';
 $string['answer'] = 'Answer';
 $string['choices'] = 'Choices';
-$string['choicex'] = 'Choice {no}';
+$string['choicex'] = 'Choice [[{no}]]';
 $string['combinedcontrolnamegapselect'] = 'drop down box';
 $string['combinedcontrolnamegapselectplural'] = 'drop down boxes';
 $string['correctansweris'] = 'The correct answer is: {$a}';