This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
[{'content': 'Green blue postmortem discoloration is seen in which poisoning - \nSelect and explain. \nA. Cyanide, B. Carbon monoxide, C. Phosphorous, D. Hydrogen sulphide', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Hydrogen sulphide o Color of post-mortem staining in various poisoning:POISONCOLORCarbon mono-oxide and hypothermiaCherry redHCN, bumsBright redNitrites, potassium chlorate, potassium bicarbonateChocolate orNitrobenzene, acetanilide, bromates, aniline (causing methaemoglobinuria)Copper brownPhosphorousDark brown or yellowHydrogen sulphideBluish green", 'role': 'assistant'}]