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: ENT
Onodi cells and Haller cells are seen in relation to following respectively - 
Select and explain. 
A. Optic nerve and floor of the orbit, B. Optic nerve and internal carotid artery, C. Optic nerve and nasolacrimal duct, D. Orbital floor and nasolacrimal duct
A: Optic nerve and floor of the orbit
Answer: A: Optic nerve and floor of the orbit 
Explanation: The Onodi and Haller cells are posterior ethmoidal air cells.