This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial cavity, Subject name: Anatomy
[{'content': 'Which is the following structure passes through the lateral pa of superior orbital fissure \nSelect and explain. \nA. Superior ophthalmic vein, B. Inferior ophthalmic vein, C. Abducent nerve, D. Nasociliary nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Superior ophthalmic vein is a tributary of cavernous sinus Passes through lateral pa of SOF which is outside the ring of Zinn through which cranial nerves passes Nasociliary nerve passes within the ring of Zinn. Inferior ophthalmic vein passes more medially to superior ophthalmic vein.', 'role': 'assistant'}]