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
Drugs causing nephrotoxicity are : a) Gentamicin b) Cloxacillin c) Phenacetin d) Erythromycin e) Doxycycline 
Select and explain. 
A. ac, B. b, C. bd, D. ad
A: ac
Answer: A: ac 
Explanation: None