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
Which enzyme is inhibited by aminophylline ? 
Select and explain. 
A. Monoamine oxidase, B. Alcohol dehydrogenase, C. Phosphodiesterase, D. Cytochrome P 450
C: Phosphodiesterase
Answer: C: Phosphodiesterase 
Explanation: None