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': 'Post moem staining gets fixed after : \nSelect and explain. \nA. 2-3 hrs., B. 3-4 hrs., C. 5-6 hrs.., D. 7-8 hours', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. 7-8 hours', 'role': 'assistant'}]