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
What is the colour of post moem staining seen in carbon monoxide poisoning? 
Select and explain. 
A. Deep blue, B. Bark brown, C. Bright red, D. Cherry red
D: Cherry red
Answer: D: Cherry red 
Explanation: Post moem staining seen in carbon monoxide poisoning is cherry red colour. A cherry red colouration of skin, mucous membrane, conjunctiva, nail beds, areas of hypostasis, blood tissues and internal organs are seen in only 15 - 20% cases of carbon monoxide poisoning. Post moem staining in various poisons: ? In asphyxial death: Bluish violet or deep purple ? Potassium chlorate, bichromates, nitrobenzene and aniline: Chocolate coloured ? Phosphorus poisoning: Dark brown ? Bluish green: Hydrogen sulphide ? Bright red: HCN/Cyanide