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
A young man has H/O of breathlessness while walking to gym. On examination he has ejection murmur which increase on Valsalva manouvcr. ECO shows LVH with deep Q wave In anterior chest leads. He should avoid 
Select and explain. 
A. Regular walking in gym, B. Verapamil, C. Digitalis, D. Sublingual nitroglycerine
C: Digitalis
Answer: C: Digitalis 
Explanation: Ref :Harrison&;s 19th E pg 1568. cardiac glycosides should be avoided, as they may increase contractility and worsen obstruction.