This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'A Toxic doses, zero order kinetics is seen in \nSelect and explain. \nA. Pencillin, B. Phenytoin, C. Valproate, D. Carbamazepine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Phenytoin follows nonlinear (or zero-order) kinetics at therapeutic concentrations, because the rate of metabolism is close to the maximum capacity of the enzymes involved Ref-KDT 6/e p31', 'role': 'assistant'}]