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
Prolonged use of one of the following anticonvulsant drugs can produce weight loss: 
Select and explain. 
A. Gabapentin, B. Oxcarbazepine, C. Topiramate, D. Valproic acid
C: Topiramate
Answer: C: Topiramate 
Explanation: 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