code: def get_confused_learning_objective_ids(self, question_id):
          
          response = self.get_response(question_id)
          if response.is_answered():
              item = self._get_item(response.get_item_id())
              return item.get_confused_learning_objective_ids_for_response(response)
          raise errors.IllegalState()
docs: get confused objective ids available for the question