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
Investigation useful for detecting extra adrenal phecochromocytoma- 
Select and explain. 
A. USG, B. CCT, C. T2-weighted MRI with gadolinium contrast, D. MIBG
C: T2-weighted MRI with gadolinium contrast
Answer: C: T2-weighted MRI with gadolinium contrast 
Explanation: 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)