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': 'Rigor mortis first start in - \nSelect and explain. \nA. Upper eyelids, B. Lower eyelids, C. Lower limbs, D. Fingers', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Among the given options, upper eyelid is involved first.', 'role': 'assistant'}]