How to insert 2 answers using Quiz submodule Short Answer? I am using the Quiz module and enabled its submodule Short Answer.

How can I insert two answers instead of one?

Note: Multiple choice is fine, but my problem is at Short Answer: I'm only able to add 1 correct answer, but my Quiz question has 2 correct answers.
I guess no solution, so I just hack the module. 

/public_html/testserver/the-exaple.com/sites/all/modules/contrib/quiz/question_types/short_answer

public function evaluateAnswer($user_answer) {
  ...
  switch ($this-&gt;node-&gt;correct_answer_evaluation) {
  case self::ANSWER_MATCH:
    if ($user_answer == $this-&gt;node-&gt;correct_answer) {
      $score = $this-&gt;node-&gt;max_score;
    }
    break;
  case self::ANSWER_INSENSITIVE_MATCH:

   ////////////////edit your code here

    break;
  case self::ANSWER_REGEX:
    if (preg_match($this-&gt;node-&gt;correct_answer, $user_answer) &gt; 0) {
      $score = $this-&gt;node-&gt;max_score;
    }
    break;
}
...
}


Since I chose my answer is insensitive, I will edit second case.