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': 'What disappears first in post mortem rigidity - \nSelect and explain. \nA. Eyelids, B. Neck, C. Lower limbs, D. Upper limbs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rigor mortis passes off in same order in which it has appeared. Thus upper eyelid is the first voluntary muscles, from which it disappears.', 'role': 'assistant'}]