QuestionForm.php

// My Form Radio Button
$this->addElement('radio', 'correctAnswer', array(
	'decorators' => $this->elementDecorators,
	'multiOptions' => array(
		'0' => 'Correct Answer',
		'1' => 'Correct Answer',
		'2' => 'Correct Answer',
		'3' => 'Correct Answer',
	),
	'class' => 'segment-answer-option',
	'required' => true,
));