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 starts from - \nSelect and explain. \nA. Eyelid muscles and lower jaw, B. Upper extremity and upper eyelid, C. Trunk muscle, lower extremity, D. Lower extremity and face', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The order of appearance (and hence also disappearance) of rigor mortis is: it first appears in involuntary muscles (heart) →3 voluntary muscles upper eyelids → neck → jaw → face → chest → upper limbs abdomen lower limbs.', 'role': 'assistant'}]