ZF2 Passing Route To Form Element

I am creating a form which needs dynamic options based on the route value of survey_question_reference

'main-surveyquestions'           => [
    'type'    => 'segment',
    'options' => [
        'route'       => '/survey-questions[/:survey_question_reference][/:answer]',
        'constraints' => [
            'survey_question_reference' => '[0-9]*',
            'answer' => '(answer)',
        ],
        'defaults'    => [
            'controller' => 'Main\Controller\Main',
            'action'     => 'surveyquestions'
        ]
    ]
],

This is the Form code which calls the Form Element:

/**
 * Init
 */
public function init()
{
    /**
     * Survey Answer
     */
    $this->add(
        [
            'type'       => 'Main\Form\Element\SurveyAnswerRadio',
            'name'       => 'survey_answer',
            'options'    => [
                'label' => 'survey_answer'
            ],
            'attributes' => [
                'id' => 'survey_answer'
            ]
        ]
    );
}

The following is the code from the Form Element. Where I have hard coded 'sqReference' => '1' the 1 needs to be replaced with the value of survey_question_reference from the route.

namespace Main\Form\Element;

use Doctrine\ORM\EntityManager;
use Zend\Form\Element\Radio;

/**
 * Class SurveyAnswerRadio
 *
 * @package Main\Form\Element
 */
class SurveyAnswerRadio extends Radio
{
    /**
     * @var EntityManager $entityManager
     */
    protected $entityManager;

    /**
     * @param EntityManager $entityManager
     */
    public function __construct(EntityManager $entityManager)
    {
        $this->entityManager = $entityManager;
    }

    /**
     * Get Value Options
     *
     * @return array
     *
     * @throws \Exception
     */
    public function getValueOptions()
    {
        $array = [];

        $result = $this->entityManager
            ->getRepository('AMDatabase\Entity\TheVerse\SA')
            ->findBy(
                [
                    'sqReference' => '1'
                ],
                [
                    'surveyAnswer' => 'ASC'
                ]
            );

        if (is_array($result) && count($result) > '0') {
            /**
             * @var \AMDatabase\Entity\TheVerse\SA $val
             */
            foreach ($result as $val) {
                $array[$val->getReference()] = $val->getSurveyAnswer();
            }
        }

        return $array;
    }
}