<prompt> A 46-year-old man has mild renal failure and hypeension which is proving difficult to manage. CT scan shows both a small adrenal tumor and bilateral hyperplasia. Which of the following is the best test to make a definitive diagnosis?Dexamethasone suppression testNP-59 adrenal scintigraphAdrenal MRISelective adrenal vein sampling  <response>: Option A- Useful for diagnosis of Cushing syndrome Option B- Used for the diagnosis of Pheochromocytoma which doesnt have renal failure CP given as BL hyperplasia Small adrenal tumor ADRENAL ADENOMA cause of Conns Syndrome Option C- Since CT scan has already been done so MRI is not that useful. Option D- useful as it can enable us to see the hormones produced by the tumor. 