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
[{'content': 'Calcium channel blockers are useful in all, EXCEPT: \nSelect and explain. \nA. Angina, B. Supraventricular arrhythmia, C. Sick sinus syndrome, D. Hypertension', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]