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': 'In dacryocystorhinostomy operation the communication of the sac is established with: \nSelect and explain. \nA. Middle meatus, B. Superior meatus, C. Inferior meatus, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Middle meatus', 'role': 'assistant'}]