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': 'Best use of lithium is in - \nSelect and explain. \nA. Treatment of schizophrenia, B. Treatment of recurrent depression, C. Treatment of first depressive episode, D. Prophylaxis of bipolar mood disorder', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]