This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Drugs to be avoided in Hyperophic obstructive cardiomyopathy is \nSelect and explain. \nA. Amiodarone, B. Verapamil, C. Beta blockers, D. Digoxin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: stepwise antihypeensive therapy effectively controlled both obstructive HCM symptoms and hypeension. ... Avoid digitalis, because glycosides are contraindicated except in patients with uncontrolled atrial fibrillation. Refer kDT 7/e p517', 'role': 'assistant'}]