This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adverse Drug Effect, Subject name: Pharmacology
All are nephrotoxic, EXCEPT 
Select and explain. 
A. Lithium, B. Gentamicin, C. Chlorpromazine, D. Cephalosporins
C: Chlorpromazine
Answer: C: Chlorpromazine 
Explanation: Ans. is 'c' i.e., Chlorpromazine Nephrotoxic drugs:Lithium - Causes Nephrogenic diabetes insipidusCephalosporins - Cause interstitial nephritis and acute tubular necrosis (cephaloridine)Gentamicin - Causes injury to proximal tubular cells leading to acute renal failure.Also knowMost nephrotoxic cephalosporin - Cephaloridine Most nephrotoxic aminoglycoside - Neomycin Least nephrotoxic aminoglycoside - Streptomycin