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
When performing a DCR, the osteum is created at the level of 
Select and explain. 
A. Superior turbinate, B. Middle turbinate, C. Inferior turbinate, D. None of the above
B: Middle turbinate
Answer: B: Middle turbinate 
Explanation: Osteum is created at the level of middle turbinate.