This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ballistics, Subject name: Forensic Medicine
[{'content': 'Bullet wipe term is used for: \nSelect and explain. \nA. Gutter fracture of skull, B. Blackening, C. Tattooing, D. Di from barrel', 'role': 'user'}, {'content': "Answer: D \nExplanation: Grease Collar (Bullet Wipe) :* A black/grey colored ring is seen lining the entrance wound.* Due to the deposition of lubricants, gun oil or lead from the bullet. * Abrasion collar surrounds the di collar.* Di collar rim is more prominent in clothing - 'bullet wipe'.* Abrasion and di collars are proof of an entry wound.", 'role': 'assistant'}]