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 kinetics occur in following drug with high dose ? 
Select and explain. 
A. Phenytoin and Theophylline, B. Digoxin and Propranolol, C. Amiloride and Probenecid, D. Lithium and Theophylline
A: Phenytoin and Theophylline
Answer: A: Phenytoin and Theophylline 
Explanation: None