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: Pathology
[{'content': 'After heart attack CK-MB levels rises most significantly around \nSelect and explain. \nA. 4-10 hrs, B. 3-6 hrs, C. 24 hrs, D. 48 hrs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]