This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Sensitive and specific marker for MI \nSelect and explain. \nA. CK-MB, B. Troponin, C. Myoglobulin, D. LDH', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cardiac troponin I or T, which are specific, sensitive, and the preferred markers of myocardial necrosis. The MB isoform of creatine kinase (CK-MB) is a less sensitive alternative.Ref: Harrison 19e pg: 1594', 'role': 'assistant'}]