This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parathyroid and adrenal glands, Subject name: Surgery
[{'content': "Most prevalent incidentaloma is: \nSelect and explain. \nA. Cushing's adenoma, B. Pheochromocytoma, C. Adrenocoical carcinoma, D. Non-functioning adenoma", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Adrenal Incidentaloma- - Incidentally detected adrenal mass through imaging performed for unrelated disease Nonfunctioning adenoma - 82% of incidentalomas Preclinical cushing - 5% Pheochromocytoma - 5% Adrenocoical Ca - 5% Metastatic Ca - 2% Aldosterone producing adenoma - 1%', 'role': 'assistant'}]