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 most useful in treatment of obsessive compulsive disorder is: \nSelect and explain. \nA. Flucytosine, B. Fluoxetine, C. Flourouracil, D. Finasteride', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fluoxetine', 'role': 'assistant'}]