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
Green blue postmortem discoloration is seen in which poisoning – 
Select and explain. 
A. Cyanide, B. Carbon monoxide, C. Hydrogen sulphide, D. Phosphorous
C: Hydrogen sulphide
Answer: C: Hydrogen sulphide 
Explanation: The colour of postmortem hypostasis in hydrogen sulphide poisoning is bluish green. It is an asphyxiant which inhibits cytochrome oxidase.