Restore distractor-specific follow-up questions

api/QuestionsApi/Services/DynamicQuestionGenerator.cs

@@ -283,7 +283,8 @@ public sealed class DynamicQuestionGenerator
         IReadOnlyDictionary<string, string> values)
     {
         var result = new Dictionary<string, WrongAnswerFollowup>();
-        foreach (var distractor in distractors)
+        var distractorList = distractors.ToList();
+        foreach (var distractor in distractorList)
         {
             if (templates.TryGetValue(distractor.Id, out var template))
             {
@@ -297,16 +298,18 @@ public sealed class DynamicQuestionGenerator
                 };
                 continue;
             }
+            var alternatives = distractorList.Where(value => value.Id != distractor.Id).Take(2).ToArray();
             result[distractor.Id] = new WrongAnswerFollowup
             {
-                Prompt = "Which option best addresses the decisive finding in this case?",
+                Prompt = $"Which limitation of option {distractor.Id} should have ruled it out in this case?",
                 Choices =
                 [
-                    new QuestionChoice { Id = correct.Id, Text = Render(correct.TextTemplate, values) },
-                    new QuestionChoice { Id = distractor.Id, Text = Render(distractor.TextTemplate, values) }
+                    new QuestionChoice { Id = "A", Text = Render(distractor.ExplanationTemplate, values) },
+                    new QuestionChoice { Id = "B", Text = Render(alternatives[0].ExplanationTemplate, values) },
+                    new QuestionChoice { Id = "C", Text = Render(alternatives[1].ExplanationTemplate, values) }
                 ],
-                CorrectChoiceId = correct.Id,
-                TeachingPoint = $"{Render(distractor.ExplanationTemplate, values)} {Render(correct.ExplanationTemplate, values)}"
+                CorrectChoiceId = "A",
+                TeachingPoint = Render(distractor.ExplanationTemplate, values)
             };
         }
         return result;