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': 'Scab or crust of abrasion appears brown in: \nSelect and explain. \nA. 12-24 h, B. 2-3 days, C. 4-5 days, D. 5-7 days', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fresh Raw & Reddish 2 - 24 hours Reddish scab (lymph, blood dries up) 2 - 3 days Reddish brown scab 4 - 5 days Brown scab 6- 7 days Scab falls off. Remember the mnemonic RRRBBB', 'role': 'assistant'}]