I haven't seen what code you might already have in place for this button, but what you're after could be done using "stopPropagation." To start, we'd want to give an ID or class to the button, similar to this:
<button type="button" id="myButton">Click me</button>
Then apply script like this to the select question:
<script>
$('#myButton').click(function(e){
e.stopPropagation();
// other stuff to happen on click...
});
</script>