<prompt> Which drug is used for topical application in respiratory papillomatosis?AcyclovirRanitidineCidofovirRibavirin  <response>: 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. 