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': 'A dead body with suspected poisoning is having hypostasis of red brown in color. It is suggestive of poisoning due to: Maharashtra 08; DNB 10; PGI 07, 08, 10, 11 \nSelect and explain. \nA. Nitrites/Aniline, B. CO, C. Cyanides, D. Hydrogen sulfide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Nitrites/Aniline', 'role': 'assistant'}]