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': 'All are true about Hypertrophic Obstructive cardiomyopathy, except - \nSelect and explain. \nA. β agonists are useful, B. Asymmetrical hypertrophy of septum, C. Dynamic L. V. outflow obstruction, D. Double apical impulse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]