This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Physiology
[{'content': 'Nonshivering thermogenesis in adults is due to: \nSelect and explain. \nA. Thyroid hormone, B. Brown fat between the shoulders, C. Noradrenaline, D. Muscle metabolism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thyroid hormone Increases the BMR which is responsible for Non-shivering thermogenesis in adults. In children & Infants Brown fat is responsible for thermogenesis. Shivering thermogenesis is by muscle metabolism, heat is produced by muscle contraction.', 'role': 'assistant'}]