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': 'All are true regarding muscular changes after death except - \nSelect and explain. \nA. Rigor mois occurs 1-2 hours after the death, B. Cadaveric spasm involves involuntary muscles, C. Rigor mois involves voluntary muscles, D. Rigor mois involves involuntary muscles', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cadaveric spasm involves a single group of voluntary muscles. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 81.', 'role': 'assistant'}]