//questionID, quizTakerID
 public async Task <JsonResult> QUAGet(string id, string qtid)
 {
     try {
         var data = QuizUserAnswerService.GetByQQIDQTID(Guid.Parse(id), Guid.Parse(qtid));
         return(Success(QuizUserAnswerVM.MsToVMs(data)));
     } catch { return(Failed(MessageUtilityService.ServerError())); }
 }