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
Calcium channel blockers are useful in all, EXCEPT: 
Select and explain. 
A. Angina, B. Supraventricular arrhythmia, C. Sick sinus syndrome, D. Hypertension
C: Sick sinus syndrome
Answer: C: Sick sinus syndrome 
Explanation: None