<prompt> A dead body is having cadaveric lividity of bluish green colour. The most likely cause of death is by poisoning due to:Hydrocyanic acidHydrogen sulphideOleanderSodium nitrite  <response>: Colour of post-moem staining in poisoning- 1 Dark brown or yellow- Phosphorus or acute copper poisoning, 2 Cherry red- CO Cold storage, 3 Bluish-green- H2S, 4 Bright red- HCN Cyanides, 5 ChocolateRed-brown coloured- NitritesNitrates, aniline, Nitrobenzene, Acetanilide, Bromates, Chlorates due to formation of Metahemoglobin. 