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
Rigor mortis starts in - 
Select and explain. 
A. Right iliac fossa, B. Left iliac fossa, C. Brain, D. Heart
D: Heart
Answer: D: Heart 
Explanation: First muscle involved in rigor mortis → Heart (myocardium)
First voluntary muscle involved in rigor mortis → Upper eyelid.