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': 'Myocardial isoenzyme of CK which is specific for myocardial infarction is - \nSelect and explain. \nA. CK-BB, B. CK-MB, C. CK-MM, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]