<prompt> Chronic dacrocystitis is due to?Obstruction in naso lacrimal ductNarrow bony canalForeign bodyAll of above  <response>: ANSWER: D All of aboveREF: Khurana 4th ed p. 370Etiology of chronic dacryocystitis is due to obstruction and stasis AETIOLOGY:Nasolacrimal obstructionNarrow bony canalExcessive folds in nasolacrimal ductForeign bodyExcessive lacrimationMild grade inflammation 