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 regarding hypertrophic cardiomyopathy, Except: \nSelect and explain. \nA. Digoxin is helpful, B. Irregular thickness of septa, C. Dynamic obstruction, D. Double apical impulse', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' Digoxin is helpful (Ref. to May 2001, Harrison 17/e, p 1484 & 16/e, p 1411).", 'role': 'assistant'}]