All of the following agents are used in obesity EXCEPT :: (A) Orlistat, (B) Sibutramine, (C) Olestra, (D) Neuropeptide Y analogues
Answer is D. Drugs used for the treatment of obesity are:

Fenfluramine
Sibutramine (serotonin and NA reuptake inhibitor)
Sucrose polyester (olestra)
β3 agonists
Dexfenfluramine
Orlistat (a Pancreatic lipase inhibitor)
Neuropeptide Y antagonists