This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'Nonshivering thermogenesis is due to \nSelect and explain. \nA. Acetylcholine, B. Norepinephrine, C. Dopamine, D. Serotonin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Non-shivering thermogenesis occurs in brown adipose tissue (brown fat) that is present in all eutherians (swine being the only exception currently known). Brown adipose tissue has a unique uncoupling protein (thermogenin, also known as uncoupling protein 1) that allows the uncoupling of protons moving down their mitochondrial gradient from the synthesis of ATP, thus allowing the energy to be dissipated as heat. It is due to norepinephrine. Ref: guyton and hall textbook of medical physiology 12 edition page number:885,886,887', 'role': 'assistant'}]