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
The cells seen after 72 hours in the infarcted area in MI are - 
Select and explain. 
A. Neutrophils, B. Lymphocytes, C. Macrophages, D. Monocytes
C: Macrophages
Answer: C: Macrophages 
Explanation: Acute inflammatory> reaction with a predominance of Neutrophils is seen up 2-3 days.
After 3 days (i.e. after 72 hours Macrophages become the predominant cell type and become involved in the removal of necrotic debris.

       In myocardial infarction.
Neutrophils appear at → 12-24 hrs.
Granulation tissue appear at → 6-10 days
The beginning of fibrosis and organization of granulation tissue → 7-14 days
Development of fibrous scar (hearing) → 2-6 weeks