Set dropdown Selected text using jquery

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This is a method that works based on the text of the option, not the index. Just tested.
 
var theText = "GOOGLE";
$("#HowYouKnow option:contains(" + theText + ")").attr('selected', 'selected');

Or, if there are similar values :
 
$("#HowYouKnow option").each(function() {
  if($(this).text() == theText) {
    $(this).attr('selected', 'selected');            
  }                        
});

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