This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Calcium channel blockers are used for all except \nSelect and explain. \nA. Angina, B. Supraventricular Arrythymia, C. Sick sinus syndrome, D. Hypeension', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Calcium channel blockers are contraindicated in sick sinus syndrome along with beta blockers . Sick sinus syndrome, also known assinus node dysfunction (SND), is adisorder of the sinoatrial (SA) node caused by impaired pacemaker function and impulse transmission producing a constellation of abnormal rhythms Refer kDT 6/e p532', 'role': 'assistant'}]