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 of true about HOCM except \nSelect and explain. \nA. Asymmetrical septal thickness, B. Left ventricular outflow obstruction, C. Double apical impule, D. Digitalis is useful', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]