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 is having cadaveric lividity of bluish green color. The most likely cause of death is by poisoning due to: AIIMS 06; DNB 10; NEET 13 \nSelect and explain. \nA. Hydrocyanic acid, B. Hydrogen sulfide, C. Oleander, D. Sodium nitrite', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Hydrogen sulfide', 'role': 'assistant'}]