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': 'DOC for rapid cycling MDP \nSelect and explain. \nA. Li, B. Valproate, C. Calcium Channel Blocker, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Valproate', 'role': 'assistant'}]