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. Classic presentation of Insulinoma : 'Whipple's triads2 : 1. Fasting hypoglycemiaQ 2 Symptoms of hypoglycemiaQ 3. Immediate relief after I. V. glucose administrationQ