<prompt> In Dacryocystorhinostomy, opening is done into:Superior meatusMiddle meatusInferior meatusNone of the above  <response>: Dacryocystorhinostomy DCR surgery is a procedure that aims to eliminate fluid and mucus retention within the lacrimal sac, and to increase tear drainage for relief of epiphora water running down the face. Classic dacryocystorhinostomy DCR requires an external incision and drilling through the lacrimal bone into the middle meatus. 