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': 'Manic-depressive illness.Which is the the most appropriate pharmacotherapeutic agent? \nSelect and explain. \nA. Triazolam, B. Tranylcypromine, C. Methylphenidate, D. Lithium carbonate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lithium carbonate prevents the mood swings characteristic of manic-depressive illness and is used in long-term therapy. Triazolam is a benzodiazepine used as a hypnotic to facilitate sleep in insomnia characterized by difficulty "falling" asleep. Methylphenidate is an amphetamine congener with a paradoxical calming effect in children with attention-deficit hyperactivity disorder. Ref: Ropper A.H., Samuels M.A. (2009). Chapter 57. Depression and Bipolar Disease. In A.H. Ropper, M.A. Samuels (Eds), Adams and Victor\'s Principles of Neurology, 9e.', 'role': 'assistant'}]