Interstitial nephritis is seen in all EXCEPT :: (A) Diuretics, (B) Beta lactams, (C) Allopurinol, (D) Isoniazid
Answer is B. Drugs causing interstitial nephritis are

Antibiotics: Cephalosporins, penicillins, ciprofloxacin, ethambutol, isoniazid, macrolides, rifampicin.
Sulfonamides, tetracyclines and vancomycin.
All NSAIDs.
Diuretics: Thiazides, furosemide, triamterene.
Others: Allopurinol, acyclovir, amlodipine, azathioprine, carbamazepine, captopril.