This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
[{'content': 'Instantaneous rigor is seen in - \nSelect and explain. \nA. Cadaveric spasm, B. Rigor mois, C. Cold stiffening, D. Gas stiffening', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cadaveric spasm is stiffness and rigidity of muscles immediately after death without moving into primary relaxation. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 81.', 'role': 'assistant'}]