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': 'Drug of choice for MDP is: \nSelect and explain. \nA. Lithium, B. Diazepam, C. Olanzapine, D. Carbamazepine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]