<prompt> Pulmonary fibrosis is the most common complication after treatment with6- mercaptopurineVincristineBleomycineAdriamycine  <response>: Ans. is c i.e., bleomycin This question has been repeated numerous times before so its well-known that Bleomycin causes Pulmonary fibrosisThe other important fact about Bleomycin is its mechanism of action. It causes DNA chain scission and inhibits repair by intercalating between DNA strandsOther drugs causing pulmonary fibrosis areacycloviramiodaronebusulphancyclophosphamidemelphalanmethotrexatemethysergide 