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
All of the following statements about phenytoin are true except : 
Select and explain. 
A. It follows saturation kinetics, B. Anti-seizure activity closely resembles plasma concentration, C. Does not depress CNS, D. Cerebellar degeneration occurs on longterm administration
D: Cerebellar degeneration occurs on longterm administration
Answer: D: Cerebellar degeneration occurs on longterm administration 
Explanation: None