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 a child with OCD, MRI will reveal reduced volume / atrophy in : \nSelect and explain. \nA. Putamen, B. Globus pallidus, C. Caudate nucleus, D. Cerebellum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Orbito Frontal cortex, basal ganglia and head of caudate nucleus are involved in obsessive compulsive disorder.', 'role': 'assistant'}]