This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmia 3, Subject name: Medicine
[{'content': 'Why is chemical cardioversion considered for patients of recurrent episodes of Atrial fibrillation? \nSelect and explain. \nA. It does not change the rhythm but improves the rate, B. It prevents the formation of a clot in the atrium, C. It is more effective than electrical cardioversion, D. It can be done electively without sedation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Option A: No, it is wrong statement. Because chemical cardioversion changes & controls the rhythm. Option B: To prevent formation of clot in atria primarily -Novel oral anti-clotting agent(NOACs)/ Rivaroxaban is used Option C: Electrical cardioversion is more superior than chemical cardioversion. Option D: Yes, chemical cardioversion can be done electively without sedation.', 'role': 'assistant'}]