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
THEOPHYLLINE CAUSES DIURESIS BECUASE OF ? 
Select and explain. 
A. BETA 2 AGONISM, B. PDE 3 INHIBITION, C. PDE 4 INHIBITOR, D. ADENOSINE A1 RECEPTOR ANTAGONISM
D: ADENOSINE A1 RECEPTOR ANTAGONISM
Answer: D: ADENOSINE A1 RECEPTOR ANTAGONISM 
Explanation: REF : KD TRIPATHI 8TH ED