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 completely charred body at autopsy, medical officer can say that the burns are antemortem if he can find - \nSelect and explain. \nA. Soot in respiratory passage, B. Cyanosis of finger nails, C. Congestion of kidney, D. Pale internal organs', 'role': 'user'}, {'content': "Answer: A \nExplanation: One of the most important characteristic of antemortenri burns is, the finding of 'Soot and carbon particles' in larynx, trachea and may be in lungs.", 'role': 'assistant'}]