This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
Natural stiffening of muscles after death is known as ? 
Select and explain. 
A. Algor mois, B. Rigor mois, C. Postmoem lividity, D. Cadaveric spasm
B: Rigor mois
Answer: B: Rigor mois 
Explanation: Ans. is 'b' i.e. Rigor mois Rigor mois is natural stiffening after death as it occurs in all death.Cadeveric spasm does not occur in all deaths.