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
Green blue postmortem discoloration is seen in which poisoning - 
Select and explain. 
A. Cyanide, B. Carbon monoxide, C. Phosphorous, D. Hydrogen sulphide
D: Hydrogen sulphide
Answer: D: Hydrogen sulphide 
Explanation: 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