This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Which drug is used for topical application in respiratory papillomatosis? \nSelect and explain. \nA. Acyclovir, B. Ranitidine, C. Cidofovir, D. Ribavirin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cidofovir Gold standard treatment for respiratory papillomatosis is Laser MLS/ Powered MLS (using microdebrider). Cidofovir is a recent drug which is used intralesionally or topically. Its active metabolite, cidofovir diphosphate, inhibits viral replication by selectively inhibiting viral DNA polymerase.', 'role': 'assistant'}]