This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
[{'content': 'Bluish green postmoem staining is present in: \nSelect and explain. \nA. Hydrogen sulphide, B. Carbon monoxide, C. Cyanide, D. Phosphorus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Normal : Blue purplish Carbon monoxide : Cherry red Cyanide : Bright Red/ Brick red Hypothermia/ Refrigeration : Pink Nitrate/ aniline/ Potassium chlorate : Chocolate Brown Septic aboion : Bronze Hydrogen sulphide : Bluish Green', 'role': 'assistant'}]