This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
House classification is based on 
Select and explain. 
A. Mental attitude of patient, B. Type of alveolar ridge, C. Maxilla and mandible relation, D. None of above
A: Mental attitude of patient
Answer: A: Mental attitude of patient 
Explanation: None