update not working append with append

My project has a button that append select option in page im using jqueryniceselect in my project but When my select option is append niceselect not work this select option im update and refresh niceselect but not work.
` $('.passengers-info-box').append(outputrecord()); $(".nicslc").niceSelect('update');
$(".nicslc").niceSelect('refresh');`

` $(document).ready(function() {
$('select').niceSelect();
});
function outputrecord() {
str='';
str +='';
str +='Nothing';
str +='Some option';
str +='';
return str;
}
`