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: Pathology
[{'content': '7 day old MI, the most sensitive biochemical marker- \nSelect and explain. \nA. Troponin I  or Troponin T, B. CPK MB, C. LDH, D. Myoglobin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]