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: Ophthalmology
[{'content': 'Which of the following is most likely to be the cause of painful third nerve palsy of sudden onset in a man of 40 \nSelect and explain. \nA. Rupture of an infraclinoid aneurysm, B. Sphenoidal ridge meningioma, C. Diabetes mellitus neuropathy, D. Rupture of a supraclinoid aneurysm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Rupture of a supraclinoid aneurysm', 'role': 'assistant'}]