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
[{'content': 'Patient is having normal CK & CKMB after 2 days of chest pain which of the following is true \nSelect and explain. \nA. Excludes diagnosis of MI, B. Reperfusion after MI, C. Extracardiac source of pain, D. Cardiac surgery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]