This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and Medicolegal Aspects, Subject name: Forensic Medicine
Which of the following is related to instant muscle contraction following death? 
Select and explain. 
A. Heat stiffening, B. Cold stiffening, C. Burns, D. Cadaveric rigidity
D: Cadaveric rigidity
Answer: D: Cadaveric rigidity 
Explanation: Ans: d (Cadaveric rigidity) Ref: Reddy, 21st ed, p. 134Cadaveric rigidity or cadaveric spasm occurs immediately after death .In this, the muscles that were contracted during life become stiff and rigid without passing into the stage of primary relaxation.Difference between rigor mortis and cadaveric spasm RIGOR MORTISCADAVERIC SPASMTime of onsetOne or two hours after deathAll muscles of the body involved, both voluntary and involuntaryInstantaneousUsually restricted to a single group of voluntary muscles Moderate force can overcome the stiffnessVery great force is required to overcome itBody temperatureLow (cold)Indicates time since deathWarmIndicates mode of death i.e., suicide or homicide