call textarea argumeng in Back End

Hi, I'm new in Contao.
When developing own module encountered a problem:
I need display data from this textarea
DCA_tl_responders
'description' => array
(
'label' => &$GLOBALS['TL_LANG']['tl_responders']['description'],
'inputType' => 'textarea',

),
in this drop-down list
DCA_tl_responders_reports
'title' => array
(
'label' => &$GLOBALS['TL_LANG']['tl_responders_reports']['title'],
'inputType' => 'select',
As I understand I need this class
class tl_responders extends Backend {


public function getEdit($varValue) {
$varValue= array();
$str = $this->Database->prepare("SELECT description FROM tl_responders ORDER BY id=?")->execute($str);


foreach($str as $rows) {
$varValue = explode(';',$rows);

}

return $varValue;
}
}
and in drop-down list need this:
'title' => array
(
'label' => &$GLOBALS['TL_LANG']['tl_responders_reports']['title'],
'inputType' => 'select',
'onsubmit_callback' => array('tl_responders','getEdit'),
but it does not work(((
Help please.