Redefina uma opção selecionada jQuery
$('#baba').prop('selectedIndex',0);
Beautiful Bug
$('#baba').prop('selectedIndex',0);$('#mySelect')
.find('option')
.remove()
.end()
.append('<option value="whatever">text</option>')
.val('whatever')
;
$('select').each( function() {
$(this).val( $(this).find("option[selected]").val() );
});