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
Which of the following cause early onset of rigor mois? 
Select and explain. 
A. Arsenic, B. Pneumonia, C. Hypothermia, D. Strychnine
D: Strychnine
Answer: D: Strychnine 
Explanation: Strychnine causes early onset of rigor mois, the rest of the options causes delayed rigor mois.