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': 'Instantaneous rigor is seen in- \nSelect and explain. \nA. Cadaveric spasm, B. Rigor mortis, C. Cold stiffening, D. Gas stiffening', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cadaveric spasm is also referred as to instantaneous rigor.', 'role': 'assistant'}]