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 mortem staining gets fixed after - \nSelect and explain. \nA. 2-3 hrs., B. 3-4 hrs., C. 5-6 hrs., D. 6-7 hrs.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Postmortem staining get fixed in 6-12 hours.', 'role': 'assistant'}]