This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
[{'content': 'Green blue postmoem discoloration is seen in which poisoning ? \nSelect and explain. \nA. Cyanide, B. Carbon monoxide, C. Hydrogen sulphide, D. Hydrogen sulphide', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'd' i.e., Hydrogen sulphide", 'role': 'assistant'}]