How to repopulate update form and radio inputs

[eluser]benners[/eluser]
Can someone please point me in the right direction to re-populate the radio buttons on an update form. I think I need to utilize form validation but I've not been able to find enough information on this.

Controller: Quiz

Code:

function update_test($comp_img)
{
$quiz_data =  $this->quiz_model->get_quiz_data($comp_img);
$data['quiz'] = $quiz_data;
$data['main_content'] = 'quiz_edit';
$this->load->view('includes/template', $data);
}

View: quiz_edit.php

Code:

echo form_open('quiz/save');
$x = 1;
foreach ($quiz as $file_item):
$data = array(
    'name'        => $x.'[correct_answer]',
    'value'       => set_radio($x.'[correct_answer]', $file_item['correct_answer']),
  );
$data2 = array(
    'name'        => $x.'[correct_answer]',
    'value'       => set_radio($x.'[correct_answer]', $file_item['correct_answer']),
  );
echo 'A:'.form_radio($data);
echo 'B:'.form_radio($data2);
$x = $x + 1;
endforeach;