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': 'Prolonged use of one of the following anticonvulsant drugs can produce weight loss: \nSelect and explain. \nA. Gabapentin, B. Oxcarbazepine, C. Topiramate, D. Valproic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Adverse effects are impairment of attention, sedation , ataxia, word finding difficulty, poor memory, weight loss, paresthesia and renal stones. All the other drugs donot cause weight loss. Ref: K D Tripati 8 th edition', 'role': 'assistant'}]