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 the true regarding hypertrophic obstructive cardiomyopathy, EXCEPT: \nSelect and explain. \nA. Digitalis is useful, B. Left ventricular outflow obstruction, C. Asymmetrical septal thickness, D. Double apical impulse', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' Digitalis is useful", 'role': 'assistant'}]