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: Pharmacology
Among the following the drug which is contraindicated in HOCM is: 
Select and explain. 
A. Beta blockers, B. Verapamil, C. Digitalis, D. Amiodarone
C: Digitalis
Answer: C: Digitalis 
Explanation: Digitalis