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 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: None', 'role': 'assistant'}]