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': 'Blow out fracture of orbit involved ? \nSelect and explain. \nA. Floor, B. Medial wall, C. Lateral wall, D. Roof', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Middle meatus In dacryocystorhinostomy, medial wall of the lacrimal sac is connected to lateral nasal wall at middle meatus", 'role': 'assistant'}]