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': 'Immediate stiffness postmoem occurs in - \nSelect and explain. \nA. Cadaveric rigidity, B. Cadaveric spasm, C. Rigor mois, D. Algor mois', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Immediate rigor occurs in cadaveric spasm which is contraction of muscles during life which become stiff and rigid immediately after death. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 81.', 'role': 'assistant'}]