This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Adrenal Gland, Subject name: Medicine
[{'content': 'All are true about pheochromocytoma except? \nSelect and explain. \nA. Urinary V.M.A is most specific, B. Paraganglioma occurs at skull base, C. 10% extra adrenal, D. Organ of Zuckerkandl is most common extra adrenal site', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Paraganglioma is a term used to describe catecholamine producing tumors in the skull base and neck. The classic rule of tens is valid for pheochromocytoma. Organ of Zuckerkandl is a collection of chromaffin cells near the origin of the inferior mesenteric aery or near the aoic bifurcation. It is the most common extra-adrenal site of pheochromocytoma. Urinary VMA is used for diagnosis of neuroblastoma and not pheochromocytoma. The most sensitive test for pheochromocytoma is urinary fractionated metanephrine', 'role': 'assistant'}]