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: Pharmacology
[{'content': 'Which is the drug of choice for maintenance therapy in uncomplicated bipolar disorder ? \nSelect and explain. \nA. Sodium valproate, B. Carbamazepine, C. Lithium, D. Lamotrigine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]