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': 'Fibrous scar in myocardial infection in well established by - \nSelect and explain. \nA. 6 weeks, B. 6 months, C. 6 days, D. 30 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]