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': 'NOT a relation of sphenoid sinus: \nSelect and explain. \nA. Optic nerve, B. Mandibular nerve, C. Maxillary nerve, D. Vidian nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Structures related to sphenoid sinus are foramen rotundum (maxillary nerve), optic canal (optic nerve and ophthalmic artery), vidian\xa0canal (with nerve), internal carotid artery.\n\xa0Mandibular nerve is not related to sphenoid sinus.', 'role': 'assistant'}]