DEMO : Resetting to first option of Listbox

<script>
$(document).ready(function() {
$("#b1").click(function(){
$("#student").prop('selectedIndex',0);
});
});
</script>

HTML

Name <select id=student name=student class='form-control'>
<option value=''>Select Student</option>
<option value='Alex'>Alex</option>
<option value='Raju'>Raju</option>
<option value='Raman'>Raman</option>
<option value='Anney'>Anney</option>
</select>

<button type='button' class='btn btn-info btn-xs ' id='b1'>Reset</button>