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
[{'content': 'In psychoanalytic terms, obsessive compulsive disorder is fixed at : \nSelect and explain. \nA. Oedipal stage, B. Genital stage, C. Oral stage, D. Anal stage', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D. i.e. Anal stage', 'role': 'assistant'}]