<script type="text/javascript" charset="utf-8">
  $(document).on('ready pjax:scriptcomplete',function(){
    // Identify the questions
    var qID = {QID};
    var q = $('#question'+qID);
 
    // Default answers
    $('table.subquestion-list tr.answers-list', q).each(function(i) {
      if($('input[type="radio"]:checked', this).length == 0) {
        $('input[type="radio"]:first', this).trigger('click');
      }
    });
    });
</script>

<script type="text/javascript" charset="utf-8">
  $(document).on('ready pjax:scriptcomplete',function(){
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    // Loop through first-row answers
    $('tr.answers-list:eq(0) input[type="radio"]', thisQuestion).each(function(i) {
 
      // Disable the first radio in the first column
      if(i == 0) {
        $(this).prop('disabled', true);
      }
      // Default answers
      else {
        var thisName = $(this).attr('name');
        if($('input[type="radio"][name="'+thisName+'"]:checked', thisQuestion).length == 0) {
          $(this).trigger('click');
        }
      }
    });
  });
</script>