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
[{'content': "5 H. indole acetic acid in urine is seen in ? \nSelect and explain. \nA. Carcinoid, B. Pheochromocytoma, C. Hirschsprung's disease, D. Wilm's tumor", 'role': 'user'}, {'content': "Answer: A \nExplanation: 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)", 'role': 'assistant'}]