This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Nelson syndrome is seen following \nSelect and explain. \nA. Cholecystectomy, B. Spleenectomy, C. Duodenectomy, D. Adrenalectomy', 'role': 'user'}, {'content': "Answer: D \nExplanation: Nelson's syndrome also referred to as post adrenalectomy syndrome occurs following bilateral adrenalectomy in patients with pituitary dependant Cushing's syndrome. The common symptoms include: hyper-pigmentation of the skin, visual disturbances, headaches, abnormal high levels of beta-MSH and ACTH, abnormal enlargements of the pituitary gland(invasive pituitary macroadenoma), interruption of menstrual cycles in women.Reference : page 776 Davidson's principles and practice of Medicine 22nd edition", 'role': 'assistant'}]