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
Which of the following is treatment for chronic dacrocystitis? 
Select and explain. 
A. Dacrocystorhinostomy, B. Dacrocystectomy, C. Massaging, D. Syringing
A: Dacrocystorhinostomy
Answer: A: Dacrocystorhinostomy 
Explanation: Ans. a (Dacrocystorhinostomy). (Ref. and Parson's 19th/501, Basak, Ophthalmology, 2nd ed., 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:# DNS# Atrophic rhinitis# Carcinoma of lacrimal gland