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
[{'content': 'Cherry red postmortem staining is seen in? \nSelect and explain. \nA. CO, B. Putrefaction, C. Arsenic poisoning, D. Postmortem', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]