This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Statement not true about rigor mois is 
Select and explain. 
A. Appears immediately after death, B. Affects both voluntary and involuntary muscles, C. Indicates time since death, D. Results from fusion of action and myosin filaments
A: Appears immediately after death
Answer: A: Appears immediately after death 
Explanation: First appears in involuntary muscles (within an hour) due to less mass and less glycogen reserve. Involuntary muscles, begins 2-4 hours after death. Persists for about 12 hours and then begins to disappear Takes 12-24 hours to disappear completely