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
[{'content': 'Zero order kinetics occur in following drug with high dose ? \nSelect and explain. \nA. Phenytoin and Theophylline, B. Digoxin and Propranolol, C. Amiloride and Probenecid, D. Lithium and Theophylline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]