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': 'Blackening around the entry wound of a firearm injury is due to? \nSelect and explain. \nA. Unburnt gunpowder, B. Burnt gunpowder, C. Flame, D. Smoke', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Smoke REF: Parikh 6th edition page 4.44 The soot or blackening is due to fine carbon paicles around the shot hole and can be readily wiped off the skin. The soot or blackening is due to smoke of black gunpowder and is comparatively less if smokeless powder is used. Note: Tattooing is due to both burnt and unburnt gunpowder', 'role': 'assistant'}]