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
Basal Metabolic Rate depends most closely on: 
Select and explain. 
A. Lean body mass, B. Body mass index, C. Obesity, D. Body surface area
A: Lean body mass
Answer: A: Lean body mass 
Explanation: A i.e. Lean body mass