This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Troponin-T is preferable to CPK-MB in the diagnosis of acute myocardial infraction in all the following situations except 
Select and explain. 
A. Beside diagnosis of MI, B. Postoperatively - after CABG, C. Reinfraction after 4 days, D. Small infracts
C: Reinfraction after 4 days
Answer: C: Reinfraction after 4 days 
Explanation: Ref Harrison 19 th ed pg 1594 Because of cardiac troponins are elevated for prolonged periods an episode of recurrent ischemia after four days would be more readily diagnosed with a marker that remains elevated in blood more briefly such as CK-MB which returns to normal levels by 72 hours .