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
[{'content': 'Treatment of nasolacrimal duct obstruction  a) Syringing  b) Probing   c) DCR  d) Dacryocystectomy  e) Antibiotic \nSelect and explain. \nA. abcde, B. abc, C. abd, D. bcd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All are treatment options for dacryocystitis.', 'role': 'assistant'}]