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': 'Marker-specific for Myocardial infarction: \nSelect and explain. \nA. Troponin I, B. Troponin C, C. Troponin T, D. LDH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The best test for diagnosis of MI is troponin I which can be quantified as a value more than 0.04ng/dl after 3 hours of onset of myocardial infarction.\nRemember TROPONIN -I can be false positive in the following cases', 'role': 'assistant'}]