protected function add_response_processing(ImsQtiWriter $item, $question)
 {
     $result = $item->add_responseProcessing();
     $this->add_score_processing($result, $question);
     $this->add_add_penalty($result, $question);
     $this->add_penalty_increase($result, $question);
     //last processing to perform;
     $this->add_answer_feedback_processing($result, $question);
     return $result;
 }