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: Psychiatry
Treatment of obscessive-compulsive disorder includes : 
Select and explain. 
A. Exposure & response prevention, B. Flooding, C. Psychoanalytic therapy, D. All
D: All
Answer: D: All 
Explanation: A. i.e. Exposure & response prevention> B i.e. Flooding > C i.e. Psychoanalytic therapy