protected function get_correct_answers($question) {
        $arrayofchoices = $this->get_array_of_choices($question);
        $arrayofplaceholdeers = $this->get_array_of_placeholders($question);

        $correctplayers = array();
        foreach ($arrayofplaceholdeers as $ph) {
            foreach ($arrayofchoices as $key => $choice) {
                if ($key + 1 == $ph) {
                    $correctplayers[] = $choice;
                }
            }
        }
        return $correctplayers;
    }