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: Biochemistry
[{'content': 'Most common determinant of energy expenditure in a resting state is: \nSelect and explain. \nA. Lean Body Mass, B. Adipose tissue, C. Resting Hea Rate, D. Exercise', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Energy expended in the resting state depends primarily on the lean body mass and the metabolic cost for processing ingested nutrients. Ref: New Developments in Obesity Research By Lawrence F. Ditmier, Page 131; Handbook of Obesity: Etiology and Pathophysiology By George A. Bray, Page 705', 'role': 'assistant'}]