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': 'Which of the following statement about phenytoin is true ? \nSelect and explain. \nA. It follows zero order kinetics, B. It is not teratogenic, C. It is excreted unchanged in urine, D. It does not induce microsomal enzymes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]