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: Pathology
[{'content': 'Post MI 10th day which of the following enzyme level is raised \nSelect and explain. \nA. LDH, B. CPK, C. Troponin, D. Myoglobin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *Most sensitive marker: CK-MB*Most cardio-specific marker: Troponin I and Troponin T*Troponins begins to rise 2 to 4 hours after MI, peaks at 48 hours and persist for 7 to10 days*CK-MB begins to rise 2 to 4 hours after MI, peaks at 24 hours and return to normal within 72 hrs*Unchanged levels of CK-MB and troponin over a period of 2hrs essentially excludes the diagnosis of MI. (Ref: Robbins 8/e p555)', 'role': 'assistant'}]