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 induced interstitial nephritis is caused by ? 
Select and explain. 
A. Methicillin, B. Cloxacillin, C. Azlocillin, D. Piperacillin
A: Methicillin
Answer: A: Methicillin 
Explanation: Ans. is 'a' i.e., Methicillin