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': 'All of the following brain areas are involved with Obsessive compulsive disorder except \nSelect and explain. \nA. Claustrum, B. Orbitofrontal cortex, C. Basal ganglia, D. Head of caudate nucleus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]