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
All are true regarding muscular changes after death except - 
Select and explain. 
A. 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
B: Cadaveric spasm involves involuntary muscles
Answer: B: Cadaveric spasm involves involuntary muscles 
Explanation: Cadaveric spasm involves a single group of voluntary muscles. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 81.