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
Zero order kinetic is shown by all EXCEPT: 
Select and explain. 
A. High dose salicylates, B. Phenytoin, C. Ethanol, D. Methotrexate
D: Methotrexate
Answer: D: Methotrexate 
Explanation: None