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
[{'content': 'What is the treatment of choice in patients with congestive hea failure with ejection fraction < 40% and normal fluid levels achieved? \nSelect and explain. \nA. ACE inhibitors + Diuretics, B. ACE inhibitors+ Beta blockers, C. ACE inhibitors + ARBs, D. ACE inhibitors + CCBs', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]