This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
In extreme cold, which is not a mechanism of thermogenesis 
Select and explain. 
A. Shivering, B. Increased secretion of epinephrine, C. Increased thyroxine, D. Piloerection
D: Piloerection
Answer: D: Piloerection 
Explanation: Piloerection- the standing up of hairs on the skin to increase thermal insulation.Ref: Ganong&;s review of medical physiology; 24th edition