This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'Weight gain is not seen with: \nSelect and explain. \nA. Chlorpromazine, B. Sodium valproate, C. Carbamazepine, D. Phentermine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref:CMDT 2010/1137 Phentermine was used for treatment of obesity. It decreases appetite and causes weight loss.', 'role': 'assistant'}]