This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cushing Syndrome, Subject name: Medicine
Obesity is seen in all except? 
Select and explain. 
A. Cushing syndrome, B. Pickwickian syndrome, C. Prader Willi syndrome, D. Sipple syndrome
D: Sipple syndrome
Answer: D: Sipple syndrome 
Explanation: Sipple syndrome/ MEN 2A charecterized by : Pheochromocytoma Medullary Carcinoma Of Thyroid Hyperparathyroidism It has a pheochromocytoma which is associated with weight loss due to sympathomimetic activity secondary to increased catecholamines.