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': 'Drug of choice in Obsessive compulsive disorder is - \nSelect and explain. \nA. Imipramine, B. Fluoxetine, C. Alprazolam, D. Chlorpromazine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]