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: Medicine
Weight gain is seen in all except: 
Select and explain. 
A. Cushings syndrome, B. Hypothyroidism, C. Pheochromocytoma, D. Insulinoma
C: Pheochromocytoma
Answer: C: Pheochromocytoma 
Explanation: Answer is C (Pheochromocytoma): Pheochronsocytoma is associated with weight loss. Cushing's syndrome, Hypothyroidism and Insulinoma are all associated with weight gain