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': 'Which is the best treatment for management of malignant pheochromocytoma? \nSelect and explain. \nA. Alpha blockers, B. Chemotherapy, C. Bulk reducing surgery, D. I131-MIBG', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The first line choice for management of malignant pheochromocytoma is I131- MIBG at monthly intervals over three to six cycles. This is followed by Averbuch Chemotherapy protocol including dacarbazine, cyclophosphamide and vincristine.', 'role': 'assistant'}]