This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
[{'content': 'Which protein secreted by adipocytes prevents obesity? \nSelect and explain. \nA. Cathepsin, B. Leptin, C. Neuropeptide Y, D. Galanin', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Leptin(Ref: Nelson's 20/e p 307-315, Ghai 8/e p 528-529)Leptin is a peptide produced by the ob gene; Its name derived from the Greek root leptos, meaning thinLeptin is secreted by adipose cells and acts primarily through the hypothalamusHigh leptin levels decrease food intake and increase energy expenditure, thereby preventing obesity", 'role': 'assistant'}]