This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology, Subject name: Forensic Medicine
Cherry red postmortem staining is seen in? 
Select and explain. 
A. CO, B. Putrefaction, C. Arsenic poisoning, D. Postmortem
A: CO
Answer: A: CO 
Explanation: Ans. (A). COCause of Death (Poisonings) can be determined by the colour of PM staining.NormalBlue purplishCarbon monoxideCherry redCyanideBright Red/ Brick redQHypothermia/ RefrigerationNitrate/ aniline/PinkPotassium chlorateChocolate BrownSeptic abortionBronzeHydrogen sulphideBluish Green