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
[{'content': 'Fetal hydantoin syndrome is caused by - \nSelect and explain. \nA. Phenytoin, B. Alcohol, C. Tetracycline, D. Sodium valproate', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Phenytoin Fetal hydantoin syndrome is characteristically associated with use of phenytoin in pregnancy.", 'role': 'assistant'}]