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': 'Neurotransmitter mainly involved in OCD is : \nSelect and explain. \nA. GABA, B. NE, C. Dopamine, D. Serotonin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Serotonergic system is implicated in the pathogenesis of OCD. Therefore selective serotonergic reuptake inhibitors is used to\xa0relieve OCD symptoms.', 'role': 'assistant'}]