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: Medicine
[{'content': 'A patient with CHF with LVEF <40% should be given? \nSelect and explain. \nA. ACEI + beta blocker, B. ACEI + furisemide, C. ACEI + CCB, D. ACEI + ARB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. ACEI + beta blockerPatient of hea failure with reduced resection fraction are treated by a combination of drugs.Drug combination- ACE inhibitors + beta blockers', 'role': 'assistant'}]