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
Delayed rigor mois occurs with which poisoning: 
Select and explain. 
A. Mercury, B. Lead, C. Arsenic, D. Strychnine
C: Arsenic
Answer: C: Arsenic 
Explanation: C i.e. Arsenic