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: Pharmacology
Drug commonly causing analgesic nephropathy is : 
Select and explain. 
A. Aspirin, B. Ibuprofen, C. Phenacetin, D. Phenylbutazone
C: Phenacetin
Answer: C: Phenacetin 
Explanation: None