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
[{'content': 'The healing contusion shows green color due to the presence of: \nSelect and explain. \nA. Bilirubin, B. Biliverdin, C. Hemosiderin, D. Oxy hemoglobin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: COLOR CHANGE PRESENCE OF AGING of contusion RED OXY-HEMOGLOBIN FEW HOURS BLUE DEOXY-HEMOGLOBIN FEW HOURS-3 DAYS BROWN HEMOSIDERIN 4-5 DAYS GREEN BILIVERDIN 6-7 DAYS YELLOW BILIRUBIN 7-12 DAYS', 'role': 'assistant'}]