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 loss may be seen in all of the following except : 
Select and explain. 
A. Uremia, B. Pheochromacytoma, C. Adrenal insufficiency, D. Insulinoma
D: Insulinoma
Answer: D: Insulinoma 
Explanation: Answer is D (Insulinoma); Insulinoma is characterised by an increase in weight (weight gain) and not by weight loss. Weight gain may result from increased food ingested to combat symptoms of hypoglycemia.