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
[{'content': 'Digoxin is used in CHF associated with: \nSelect and explain. \nA. HOCM (Hypertrophic obstructive cardiomyopathy), B. High output failure, C. Atrial fibrillation with high ventricular rate, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Digitalis should be used for patients\n\nWho remain symptomatic even on diuretics and ACE inhibitors.\nWith heart failure who are in atrial fibrillation and require ventricular rate control.\n\nNote: Digitalis is contraindicated in HOCM and high output cardiac failure.', 'role': 'assistant'}]