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
In a child with OCD, MRI will reveal reduced volume / atrophy in : 
Select and explain. 
A. Putamen, B. Globus pallidus, C. Caudate nucleus, D. Cerebellum
C: Caudate nucleus
Answer: C: Caudate nucleus 
Explanation: Orbito Frontal cortex, basal ganglia and head of caudate nucleus are involved in obsessive compulsive disorder.