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
Gold standard for diagnosing pheochromocytoma is 
Select and explain. 
A. Urinary metanephrines, B. CT Abdomen, C. MIBG scan, D. Biopsy
D: Biopsy
Answer: D: Biopsy 
Explanation: Biopsy is avoided in pheochromocytoma.