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
[{'content': 'The hormone associated with cold adaption is \nSelect and explain. \nA. Growth hormone, B. Thyroxine, C. Insulin, D. Melanocyte stimulating hormone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Thyroxine increases the metabolism.', 'role': 'assistant'}]