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 a firearm injury, blackening seen around the entry wound is due to: DNB 09 \nSelect and explain. \nA. Flame, B. Smoke, C. Unburnt powder, D. Hot gases', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Smoke', 'role': 'assistant'}]