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
[{'content': 'Color of postmoem staining in cyanide poisoning is \nSelect and explain. \nA. Deep blue, B. Bright red, C. Dark brown, D. Bluish green', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Color of postmoem staining Cause of death color of PMS Cyanides bright red(oxygen Hbu) Carbon monoxide cherry red(carboxy Hbu) Carbon dioxide deep blue(reduced Hbu) Hydrogen sulphide bluish green(sulphmet Hbu) Phosphorus, copper Dark brown Opiates black Nitrates, aniline, potassium chlorate, nitrobenzene, potassium bicarbonate chocolate brown, or coffee brown(metHb) Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 24', 'role': 'assistant'}]