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 chronic dacrocystitis  a) Dacrocystorhinostomy     b) Antibiotics    c) Probing    d) Massage 
Select and explain. 
A. abcd, B. abc, C. acd, D. bcd
A: abcd
Answer: A: abcd 
Explanation: None