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
A Toxic doses, zero order kinetics is seen in 
Select and explain. 
A. Pencillin, B. Phenytoin, C. Valproate, D. Carbamazepine
B: Phenytoin
Answer: B: Phenytoin 
Explanation: 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