text: from bson import ObjectId
  from mongoengine import StringField, BooleanField, EmbeddedDocument, ObjectIdField
  
  
  class QuestionOption(EmbeddedDocument):
      _id = ObjectIdField(required=True, default=lambda: ObjectId())
      sentence = StringField(required=True)
      correct = BooleanField(required=True, default=False)
  