<prompt> In dacrocystorhinostomy DCR lacrimal sacs are directly opened into:Superior nasal meatusMiddle nasal meatusInferior nasal meatusNasolacrimal duct  <response>: Ans. b Middle nasal meatus. Ref. Basaks, Opthalmology, 2nd ed., pg, 282, 336DACROCYSTORHINOSTOMY DCR It is surgical procedure of choice in chronic dacrocystitis, in which a communication is made between lacrimal sac and middle meatus of nose. Contraindications: MH2000- DNS- Atrophic rhinitis- Carcinoma of lacrimal gland 