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: Medicine
Patient is having normal CK & CKMB after 2 days of chest pain which of the following is true 
Select and explain. 
A. Excludes diagnosis of MI, B. Reperfusion after MI, C. Extracardiac source of pain, D. Cardiac surgery
A: Excludes diagnosis of MI
Answer: A: Excludes diagnosis of MI 
Explanation: None