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
NOT a relation of sphenoid sinus: 
Select and explain. 
A. Optic nerve, B. Mandibular nerve, C. Maxillary nerve, D. Vidian nerve
B: Mandibular nerve
Answer: B: Mandibular nerve 
Explanation: Structures related to sphenoid sinus are foramen rotundum (maxillary nerve), optic canal (optic nerve and ophthalmic artery), vidian canal (with nerve), internal carotid artery.
 Mandibular nerve is not related to sphenoid sinus.