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
[{'content': 'Gold standard for diagnosing pheochromocytoma is \nSelect and explain. \nA. Urinary metanephrines, B. CT Abdomen, C. MIBG scan, D. Biopsy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Biopsy is avoided in pheochromocytoma.', 'role': 'assistant'}]