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': 'Area of brain involved in OCD: March 2004 \nSelect and explain. \nA. Basal ganglia, B. Temporal lobe, C. Cerebellum, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Basal ganglia', 'role': 'assistant'}]