<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 50-year-old man with a history of atrial fibrillation presents to his cardiologists office for a follow-up visit. He recently started treatment with an anti-arrhythmic drug to prevent future recurrences and reports that he has been feeling well and has no complaints. The physical examination shows that the arrhythmia appears to have resolved; however, there is now mild bradycardia. In addition, the electrocardiogram recording shows a slight prolongation of the PR and QT intervals. Which of the following drugs was most likely used to treat this patient?? A: Carvedilol, B: Metoprolol, C: Propranolol, D: Sotalol, E: Verapamil,  <response>: This is a clinical vignette about a 50-year-old man with a history of atrial fibrillation who is on antiarrhythmic medication. He is now experiencing bradycardia and ECG changes including prolonged PR and QT intervals. The question asks which antiarrhythmic medication he is most likely taking. Based on the side effects of bradycardia and QT prolongation, the medication is likely a class III antiarrhythmic like sotalol or amiodarone. Beta blockers like metoprolol can cause bradycardia but not QT prolongation. Calcium channel blockers like verapamil would not cause QT prolongation. Therefore, the most likely medication he is taking is a class III antiarrhythmic.D: Sotalol 