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': 'Treatment of choice in ventricular fibrillation is: \nSelect and explain. \nA. Sotalol, B. Cardioversion, C. Ibutilide, D. Adenosine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]