This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Investigation of choice in pheochromocytomais- \nSelect and explain. \nA. CTscan, B. Urinary catecholamines, C. MlBGscan, D. Urinary calcium measurement', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pheochromocytoma synthesize and store catecholamines. Elevated plasma and urinary levels of catecholamines are impoant for diagnosis Ref -( Harrison 17 pg 2270)', 'role': 'assistant'}]