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 true about hyperophic obstructive cardiomyopathy except 
Select and explain. 
A. Digitalis is usefull, B. Left ventricular outflow obstruction, C. Asymmetrical septal thickness, D. Double apical impulse
A: Digitalis is usefull
Answer: A: Digitalis is usefull 
Explanation: Ref Harrison 19 th ed pg 1569 Digitalis is contraindicated in hyperophy obstructive cardiomyopathy HOCM.