<prompt> Nelson syndrome is seen in:AdrenalectomyHypopitutarismDeficiency of beta cellsDeficiency of growth hormone  <response>: a. AdrenalectomyRef: Nelsons 20e p 2714-2723, Ghai 8e p 526-527Adrenalectomy, in a case of pituitary adenoma, may lead to increased ACTH secretion by an unresected pituitary adenoma, evidenced mainly by marked hyperpigmentation; this condition is termed Nelson syndrome. 