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
All of the following brain areas are involved with Obsessive compulsive disorder except 
Select and explain. 
A. Claustrum, B. Orbitofrontal cortex, C. Basal ganglia, D. Head of caudate nucleus
A: Claustrum
Answer: A: Claustrum 
Explanation: None