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
Heat stiffening occurs at temperature above: 
Select and explain. 
A. 30degC, B. 40degC, C. 50degC, D. 60degC
D: 60degC
Answer: D: 60degC 
Explanation: Heat stiffening occur when a body is exposed to temperatures above 65 degree celsius. In this condition, rigidity is produced which is more marked than rigor mois. Heat stiffening occur because of denaturation of muscle proteins. Degree and depth of stiffening depend on the intensity of heat and the time for which it was applied. It is seen in death from burning, high voltage electric shock and from falling into hot liquid.