This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
Ideal temperature to preserve the body for a post moem is 
Select and explain. 
A. 0 degrees, B. 4 degrees, C. 10 degrees, D. - 4 degrees
B: 4 degrees
Answer: B: 4 degrees 
Explanation: The ideal temperature for keeping a dead body for autopsy is 4degC. To keep a body for long duration for other purposes the temperature is -20degC. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 42