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': 'Dark brown post mortem lividity is seen in- \nSelect and explain. \nA. Aniline, B. CO, C. Phosphorus, D. Hydrocyanide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Phosphorus poisoning causes dark brown or yellow postmortem staining.', 'role': 'assistant'}]