This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Myocardial infarction shows fibrosis. What is the duration? 
Select and explain. 
A. 2 days, B. 5 days, C. 1 week, D. 3 weeks
B: 5 days
Answer: B: 5 days 
Explanation: Fibrosis after MI sets in by 5 days. Basic Pathology, Robbins. Page no.: 380