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: Biochemistry
[{'content': 'Serum marker to return to normal level, last in myocardial infarction is: \nSelect and explain. \nA. Lactate dehydrogenase, B. Creatine phosphokinase, C. Aspaate transmainase, D. Myoglobin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Enzymes in MILDH is the last enzyme to rise (3-4 days) and also the last enzyme to return to normal level in MI (10-15 days)CPK returns to normal by 2-3 daysAST/ SCOT returns to normal by 4-5 daysMyoglobin returns to normal by 20-25 hours', 'role': 'assistant'}]