This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adverse Drug Effect, Subject name: Pharmacology
Drug which 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., GabapentinDrugs causing folate deficiencyInterference with folic acid absorptionInhibition of dihydrofolate reductaseImpair folate metabolismo Phenytoino Phenobarbitone\o Primidoneo Sulfasalazineo Cotrimoxazoleo Methotrexateo Pyrimethamineo Triametereneo Pentamidineo Trimethoprimo Alcohol