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': 'Drug contra-indicated in HOCM is: March 2011 \nSelect and explain. \nA. Verapamil, B. Propranolol, C. Digoxin, D. Amiadarone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Digoxin Digoxin and vasodilators may increase outflow tract obstruction and should be avoided in HOCM', 'role': 'assistant'}]