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: Surgery
5 H. indole acetic acid in urine is seen in ? 
Select and explain. 
A. Carcinoid, B. Pheochromocytoma, C. Hirschsprung's disease, D. Wilm's tumor
A: Carcinoid
Answer: A: Carcinoid 
Explanation: Answer is 'a' i.e. Carcinoid The diagnosis of carcinoid syndrome relies on measurement of urinary or plasma serotonin or its metabolite (5- HIAA) in the urine In pheochromocytoma urine is positive for - catecholamines or its metabolites (VMA, metanephrines)