All drugs cause interstitial lung disease, except :: (A) Phenytoin sodium, (B) Sulfonamide, (C) Busulfan, (D) Alpha methyldopa
Answer is D. Drugs causing interstitial lung disease are:

Amiodarone
Nitrosoureas
Busulfan
Phenytoin
Methotrexate
Sulfonamides
Penicillamine
Cyclophosphamide
Nitrofurantoin
Gold salts
Bleomycin