This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'All are true about hyperophic obstructive cardiomyopathy except \nSelect and explain. \nA. Digitalis is usefull, B. Left ventricular outflow obstruction, C. Asymmetrical septal thickness, D. Double apical impulse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 19 th ed pg 1569 Digitalis is contraindicated in hyperophy obstructive cardiomyopathy HOCM.', 'role': 'assistant'}]