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
[{'content': 'Haller cells are seen in? \nSelect and explain. \nA. Roof of nose, B. Orbital floor, C. Lateral nasal wall, D. Maxillary sinus', 'role': 'user'}, {'content': "Answer: B \nExplanation: The Onodi and Haller cells are ethmoidal air cells. Some air cells may invade the orbital floor. These are known as the Haller' cells. The Onodi cell is usually regarded as the most posterior ethmoid cell that pneumatizes lateral and superior to the sphenoid sinus and is intimately associated with the optic nerve.", 'role': 'assistant'}]