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': 'Basal Metabolic Rate depends most closely on: \nSelect and explain. \nA. Lean body mass, B. Body mass index, C. Obesity, D. Body surface area', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Lean body mass', 'role': 'assistant'}]