This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Which one of the following molecules serve as the earliest marker in myocardial infarction \nSelect and explain. \nA. Myoglobin, B. Troponin, C. HbA2, D. CK MB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Myoglobin is found in cardiac and skeletal muscle. It is released more rapidly from infarcted myocardium than troponin and CK-MB and may be detected as early as two hours after an acute myocardial infarction. Ref: Biochemistry by U. Satyanarayana 3rd edition Pgno : 107-112', 'role': 'assistant'}]