This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiomyopathies, Subject name: Medicine
[{'content': 'Digoxin is contraindicated in? \nSelect and explain. \nA. Small VSD with hea failure, B. Viral myocarditis with hea failure, C. Atrial fibrillation with hea failure, D. Small ASD with hea failure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Digoxin C/I in HOCM Adult Patient with HFrEF Viral Myocarditis Option C: A. fibrillation rate control= Esmolol A.Fibrillation +BP<80= Digoxin A.Fibrillation + Acute CHF= Digoxin', 'role': 'assistant'}]