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': 'For phenytoin all are true except? \nSelect and explain. \nA. Cause hirsuitism, B. Teratogenic effect, C. Narrow therapeutic index, D. Does not need drug dosage monitoring', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]