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
Which one of the following drugs does not interfere with folic acid metabolism? 
Select and explain. 
A. Phenytoin, B. Gabapentin, C. Phenobarbitone, D. Primidone
B: Gabapentin
Answer: B: Gabapentin 
Explanation: Ans. is 'b' i.e., Gabapentin Antiepileptics interfering with folic acid metabolism. 1. Phenytoin 2. Phenobarbitone 3. Primidone