// A jQuery plugin to render column(s) in checkbox arrays exclusive
(function( $ ){
 
  $.fn.cbExclusiveColumns = function(options) {  
 
    var opts = $.extend( {
      //columns: [3,4] // Column(s) to be exclusive (comma-separated) 
    }, options);
 
    return this.each(function() { 
 
      var thisQuestion = $(this)
 
      // Add some classes to the checkbox cells
      $('td.answer-item', thisQuestion).addClass('normal-item');
      $('tr.subquestion-list', thisQuestion).each(function(i) {
        var thisRow = $(this);
        $.each(opts.columns, function(i, val) {
          $('td.answer-item:eq('+(val-1)+')', thisRow).removeClass('normal-item').addClass('exclusive-item');
        });
      });
 
      // A listener on the checkboxes
      $('input[type="checkbox"]', thisQuestion).on('change', function (event) {
        handleExclusive($(this).closest('td'));
      });
 
      function handleExclusive(thisCell) {
 
        var thisRow = $(thisCell).closest('tr');
 
        // Uncheck the appropriate boxes in a row
        if ($(thisCell).hasClass('normal-item')) {
          $('.exclusive-item input[type="checkbox"]', thisRow).prop('checked', false);
          $('.exclusive-item input[type="text"]', thisRow).val('');
        }
        else {
          $('.answer-item', thisRow).not(thisCell).find('input[type="checkbox"]').prop('checked', false);
          $('.answer-item', thisRow).not(thisCell).find('input[type="text"]').val('');
        }
 
        // Check conditions (relevance)
        $('td.answer-item', thisRow).each(function(i) {
          var thisValue = '';
          if($('input[type="checkbox"]', this).is(':checked')) {
            thisValue = 1;
          }
          var thisSGQA = $('input[type="checkbox"]', this).attr('id').replace(/cbox_/, '');
 
          $('input[type="hidden"]', this).attr('value', thisValue);
          fixnum_checkconditions(thisValue, thisSGQA, 'hidden');
        });
      }
    });
 
  };
})( jQuery );

<script type="text/javascript" charset="utf-8">
  $(document).on('ready pjax:scriptcomplete',function(){
    $('#question{QID}').cbExclusiveColumns({
      columns: [3,4] // Column(s) to be exclusive (comma-separated)
    });
  });
</script>