This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'THEOPHYLLINE CAUSES DIURESIS BECUASE OF ? \nSelect and explain. \nA. BETA 2 AGONISM, B. PDE 3 INHIBITION, C. PDE 4 INHIBITOR, D. ADENOSINE A1 RECEPTOR ANTAGONISM', 'role': 'user'}, {'content': 'Answer: D \nExplanation: REF : KD TRIPATHI 8TH ED', 'role': 'assistant'}]