old_contents: from django.db import models
  
  # Create your models here.
  
new_contents: from django.db import models
  
  
  class Question(models.Model):
      question = models.CharField(max_length=256)
      hints = models.CharField(max_length=256, blank=True)
      answer = models.CharField(max_length=256)
  
      def __str__(self):
          return str(self.question)
  
  
  class MultipleChoiceQuestion(Question):
      choices = models.CharField(choices=[])
      correct = models.IntegerField()
  
      @classmethod
      def create(cls, choices, correct):
          CHOICES = [(index, item) for index, item in enumerate(choices)]
          answer = CHOICES[correct][1]
          mcq = cls(choices=CHOICES, correct=correct, answer=answer)
          return mcq
subject: Add models for questions