This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
Oncocytic carcinoma arises from- 
Select and explain. 
A. Perivascular, B. Glomerulus, C. Loop of henle, D. Collecting duct
D: Collecting duct
Answer: D: Collecting duct 
Explanation: Oncocytoma is a benign epithelial tumour composed of large eosinophilic cells having small, round,benign-appearing nuclei that have large nucleoli. It is thought to arise from the intercalated cells of collecting ducts. Ultrastructurally the eosinophilic cells have numerous mitochondria. From Pathologic basis of disease Robbins 8th edition pg no:964