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
Immediate stiffness postmoem occurs in - 
Select and explain. 
A. Cadaveric rigidity, B. Cadaveric spasm, C. Rigor mois, D. Algor mois
B: Cadaveric spasm
Answer: B: Cadaveric spasm 
Explanation: 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.