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: Pharmacology
[{'content': 'All of the following agents are used in obesity EXCEPT : \nSelect and explain. \nA. Orlistat, B. Sibutramine, C. Olestra, D. Neuropeptide Y analogues', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Drugs used for the treatment of obesity are:\n\nFenfluramine\nSibutramine (serotonin and NA reuptake inhibitor)\nSucrose polyester (olestra)\nβ3 agonists\nDexfenfluramine\nOrlistat (a Pancreatic lipase inhibitor)\nNeuropeptide Y antagonists', 'role': 'assistant'}]