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: Anatomy
Onodi cells and Haller cells of ethmoid labyrinth is seen in relation to following respectively 
Select and explain. 
A. Optic nerve and floor of orbit, B. Optic nerve and internal carotid aery, C. Optic nerve & naso lacrimal duct, D. Orbital floor and nsolacrimal duct
A: Optic nerve and floor of orbit
Answer: A: Optic nerve and floor of orbit 
Explanation: A i.e. Optic nerve and floor of orbit Agger nasi cells are medial relations of lacrimal sac & duct; Haller's cells develop medially beneath orbital floort2 and Sphenoethmoid or Onodi cells is intimately related to optic nerve & canal and internal carotid aeryQ. It may contain tuberculum nervi optic, where the optic canal bulges into the wall of onodi cell. And optic nerve injury is a devastating complication of endoscopic sinus surgery, paicularly if a sphenoethmoid cell is present.