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: Physiology
In human being, the least useful physiological response to low environmental temperature is: 
Select and explain. 
A. Shivering, B. Vasoconstriction, C. Release of thyroxine, D. Piloerection
D: Piloerection
Answer: D: Piloerection 
Explanation: D i.e. Piloerection