This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lacrimal Gland, Subject name: Ophthalmology
[{'content': 'In dacrocystorhinostomy (DCR) lacrimal sacs are directly opened into: \nSelect and explain. \nA. Superior nasal meatus, B. Middle nasal meatus, C. Inferior nasal meatus, D. Nasolacrimal duct', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. b (Middle nasal meatus). (Ref. Basak's, Opthalmology, 2nd ed., pg, 282, 336)DACROCYSTORHINOSTOMY (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: (MH'2000)- DNS- Atrophic rhinitis- Carcinoma of lacrimal gland", 'role': 'assistant'}]