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': 'Which enzyme is inhibited by aminophylline ? \nSelect and explain. \nA. Monoamine oxidase, B. Alcohol dehydrogenase, C. Phosphodiesterase, D. Cytochrome P 450', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]