This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanical injuries, Subject name: Forensic Medicine
Blue color of contusion seen at 
Select and explain. 
A. First day, B. 2-3 days, C. 4-5 days, D. 5-6 days
B: 2-3 days
Answer: B: 2-3 days 
Explanation: The age of contusion Time since injury color change first day red(Hb) 2-3 days blue(deoxyHb) 4-5 days bluish black/brown(hemosiderin) 5-6 days greenish(hematoidin) 7-10days yellow(bilirubin) By 14 days normal ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE NO 118