public AnswerBase AddAnswerFor(OpenQuestion qOpen)
 {
     _answers.Add(qOpen, qOpen.CreateAnswer());
     return _answers[qOpen];
     throw new NotImplementedException();
 }
 public AnswerBase FindAnswer(OpenQuestion qOpen)
 {
     return _answers.ContainsKey(qOpen) ? _answers[qOpen] : null;
     throw new NotImplementedException();
 }