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': 'Folate deficiency occurs due to \nSelect and explain. \nA. Phenytoin, B. Phenbarbitone, C. Primidone, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phenytoin , phenobarbitone and primidone(metabolized to phenobarbitone in body ) causes megaloblastic anemia as phenytoin decreases absorption and increases excretion of folate ref KD TRIPATHI 8TH ED.', 'role': 'assistant'}]