Q2: (Single Choice) <script type="text/javascript" charset="utf-8">
  $(document).ready(function() {
 
                // Maximum answers
                var maxAnswers = 1;
 
                // Identify this question
 
                var thisQuestion = $('#question{QID}');
 
                function checkMax() {
                        $('input[type="checkbox"]', thisQuestion).prop('disabled', false);
                        if($('input[type="checkbox"]:checked', thisQuestion).length >= maxAnswers) {
                                $('input[type="checkbox"]', thisQuestion).not(':checked').prop('disabled', true);
                        }
                }
    
                // Initial checkbox states
                checkMax();
      
                // Listener on the checkboxes
                $('input[type="checkbox"]', thisQuestion).change(function(e) {
                        checkMax();
                });
 
                // Remove any "disabled" properties before submitting
                $('#ls-button-submit').bind('click', function () {
                        $('input[type="checkbox"]', thisQuestion).prop('disabled', false);
                });
 
    });
</script>