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
All are the true regarding hypertrophic obstructive cardiomyopathy, EXCEPT: 
Select and explain. 
A. Digitalis is useful, B. Left ventricular outflow obstruction, C. Asymmetrical septal thickness, D. Double apical impulse
A: Digitalis is useful
Answer: A: Digitalis is useful 
Explanation: Ans. is 'a' Digitalis is useful