This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
Cherry red colour of blood is seen in poisoning with 
Select and explain. 
A. Nitrate, B. Cyanide, C. Lead, D. Sulphite
B: Cyanide
Answer: B: Cyanide 
Explanation: Colour of death by poisoning: Cyanide- bright red Carbon monoxide - cherry red Carbon dioxide- deep blue Phosphorus, copper- dark brown Hydrogen sulphide- bluish green Opiates- black Nitrite, aniline, potassium chlorate, nitrobenzene, potassium bicarbonate- chocolate brown or coffee brown. Ref: FORENSIC MEDICINE AND TOXICOLOGY DR P C IGNATIUS THIRD EDITION PAGE 24