All about radiological evaluation of a patient with Cushing's syndrome are true except-

• A. MRI of the adrenals may distinguish adrenal adenoma from carcinoma
• B. Adrenal CT scan distinguished adrenal cortical hyperplasia from an adrenal tumor
• C. MRI of the sella turcica will identify a pituitary cause for Cushing's syndrome
• D. Petrosal sinus sampling is the best way to distinguish a pituitary tumor from an ectopic ACTH producing tumor