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': 'True about phenytoin is \nSelect and explain. \nA. First pass metabolism, B. Not teratogenic, C. Drug of choice for absence seizure, D. causes nystagmus and ataxia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]