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
All are true about Hypertrophic Obstructive cardiomyopathy, except - 
Select and explain. 
A. β agonists are useful, B. Asymmetrical hypertrophy of septum, C. Dynamic L. V. outflow obstruction, D. Double apical impulse
A: β agonists are useful
Answer: A: β agonists are useful 
Explanation: None