This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Paralysis of 3rd, 4th, 6th nerves with involvement of ophthalmic division of 5th nerve,localizes the lesion to \nSelect and explain. \nA. Cavernous sinus, B. Apex of orbit, C. Brainstem, D. Base of skull', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 3,4,5 cranial nerves pass in relation to the lateral wall of cavernous sinus. 6th cranial nerve passes through the cavernous sinus. Ref - BDC 6th vol3 topic - cranial nerves ;pg350', 'role': 'assistant'}]