Set Two option set value in Portal using Javascript

Hi All,

I am trying to set Two option value from javascript but i am unable to do so, i have also set text field which is working fine,

below is my code,

$(document).ready(function(){

$('#tt_needs').val('test'); // text field which is working fine

$('#adx_partnercreated').val('1'); // unable to set two option set value

});

Thanks,

Shahbaaz