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': 'Treatment of choice in ventricular fibrillation is \nSelect and explain. \nA. Sotalol, B. Cardioversion, C. Ibutilide, D. Adenosine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer kDT 7/e 538 A class of medications called beta blockers is commonly used in people at risk of ventricular fibrillation or sudden cardiac arrest. Implantable cardioveer-defibrillator (ICD). After your condition stabilizes, your doctor is likely to recommend implantation of an ICD. ... The ICD constantly monitors your hea rhythm', 'role': 'assistant'}]