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: Forensic Medicine
[{'content': 'In firearm injury, entry-wound blackening is due to : \nSelect and explain. \nA. Flame, B. Hot gases, C. Smoke, D. Unburned powder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Smoke - The blackening of entery wound is due to fine carbon paicles in smokeQ. Grease (abrasion) collar is seen in firearm entry woundQ. - Bevelling of skull is seen in exit wound (point) of bulletQ.', 'role': 'assistant'}]