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 used in all, except - \nSelect and explain. \nA. Angina, B. Supraventricular tachycardia, C. Sick sinus syndrome, D. Hypeension', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Sick sinus syndrome o Calcium channel blockers suppress SA node automaticity --> can cause cardiac arrest in sick sinus syndrome.", 'role': 'assistant'}]