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
The hormone associated with cold adaption is 
Select and explain. 
A. Growth hormone, B. Thyroxine, C. Insulin, D. Melanocyte stimulating hormone
B: Thyroxine
Answer: B: Thyroxine 
Explanation: Thyroxine increases the metabolism.