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
7 day old MI, the most sensitive biochemical marker- 
Select and explain. 
A. Troponin I  or Troponin T, B. CPK MB, C. LDH, D. Myoglobin
A: Troponin I  or Troponin T
Answer: A: Troponin I  or Troponin T 
Explanation: None