This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Treatment of nasolacrimal duct obstruction  a) Syringing  b) Probing   c) DCR  d) Dacryocystectomy  e) Antibiotic 
Select and explain. 
A. abcde, B. abc, C. abd, D. bcd
A: abcde
Answer: A: abcde 
Explanation: All are treatment options for dacryocystitis.