This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Secondary hyperparathyroidism is seen in all EXCEPT: \nSelect and explain. \nA. Chronic renal failure, B. Vitamin D deficiency, C. Medullary carcinoid syndrome, D. Adenoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: Adenoma REF: Harrison's 17' ed p. 2388 Causes of secondary hyperparathyroidism Chronic renal failure Malabsorption syndrome Vitamin D deficiency Medullary carcinoma thyroid", 'role': 'assistant'}]