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: Medicine
[{'content': 'Reperfusion is useful for - \nSelect and explain. \nA. Stunt myocardium, B. Hibernating myocardium, C. Non ischaemic viable myocardium, D. Mixed ischaemic myocardium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]