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 OCD treatment is based on: \nSelect and explain. \nA. Serotonergic receptor, B. Dopaminergic receptor, C. NA receptor receptor, D. Glutamate receptor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Serotonin receptor', 'role': 'assistant'}]