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
An elderly hypertensive has diabetes mellitus and bilateral renal artery stenosis. The best management is: 
Select and explain. 
A. Enalapril, B. Verapamil, C. Beta blockers, D. Thiazides
C: Beta blockers
Answer: C: Beta blockers 
Explanation: None