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 useful for detecting extra adrenal phecochromocytoma- \nSelect and explain. \nA. USG, B. CCT, C. T2-weighted MRI with gadolinium contrast, D. MIBG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: T2 weighted MRI with gadolinium contrast is optional for detecting pheochromocytoma and is somewhat better than CT for imaging extra adrenal pheochromocytoma and paragangliomas Ref ( Harrison 17 pg 2271)', 'role': 'assistant'}]