public static void SaveQuizAnswers(String phoneNumberSave, String Answer){
      Transaction txn = datastore.beginTransaction();
        try {
          Entity entity = new Entity(QUIZ);
          entity.setProperty(PHONE_NO, phoneNumberSave);
          entity.setProperty(ANSWER, Answer);
          datastore.put(entity);
          txn.commit();
        } finally {
          if (txn.isActive()) {
            txn.rollback();
          }
        }
  }

String Answer = req.getParameter("Answer");
String phoneNumberSave = req.getParameter("phoneNumber");
Datastore.SaveQuizAnswers(phoneNumberSave, Answer);