<prompt> Pheochromocytoma is a tumour of the:Adrenal cortexParathyroidsPituitaryNone of the above  <response>: Most adrenal medullary tumors pheochromocytomas secrete norepinephrine or epinephrine or both and produce sustained hypertension.Pheochromocytoma is a tumour of the adrenal medulla.Reference: Ganongs Review of Medical Physiology T W E N T Y - F I F T H E D I T I O N page no 356 