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': 'Nystens rule is regarding: \nSelect and explain. \nA. Sequence of appearance of livor mortis, B. Postmortem changes in the retina, C. Sequence of appearance of rigor mortis, D. Postmortem changes in vitreous', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nystens rule states that there is a particular order in which rigor mortis appears and it diappears in the same order.', 'role': 'assistant'}]