code: def get_correctness_for_response(self, response):
          
          for answer in self.my_osid_object.get_answers():
              if self._is_match(response, answer):
                  try:
                      return answer.get_score()
                  except AttributeError:
                      return 100
          for answer in self.my_osid_object.get_wrong_answers():
              if self._is_match(response, answer):
                  try:
                      return answer.get_score()
                  except AttributeError:
                      return 0
          return 0
docs: get measure of correctness available for a particular response