This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hea failure, Subject name: Medicine
What is the treatment of choice in patients with congestive hea failure with ejection fraction < 40% and normal fluid levels achieved? 
Select and explain. 
A. ACE inhibitors + Diuretics, B. ACE inhibitors+ Beta blockers, C. ACE inhibitors + ARBs, D. ACE inhibitors + CCBs
B: ACE inhibitors+ Beta blockers
Answer: B: ACE inhibitors+ Beta blockers 
Explanation: The Drug of choice used in congestive hea failure with reduced ejection fraction is ACE inhibitors + diuretics. Once euvolumic status is achieved, ACE inhibitors+beta blockers are drugs of choice.