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
Deep blue colour of hypostasis is seen in death due to poisoning by: 
Select and explain. 
A. Potassium cyanide, B. Phosphorus, C. Aniline dyes, D. Carbon monoxide
C: Aniline dyes
Answer: C: Aniline dyes 
Explanation: Aniline dye poisoning causes methaemoglobinaemia which gives deep blue colour hypostasis after death. Other poisonings which cause methaemoglobinaemia are, nitrites, potassium chlorate, potassium bicarbonate, nitrobenzene, acetanilide and bromates. Ref: The Essentials of Forensic Medicine and Toxicology By K S Narayan Reddy, 27th Edition, 136, 137,139