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
Which of the following is most likely to be the cause of painful third nerve palsy of sudden onset in a man of 40 
Select and explain. 
A. Rupture of an infraclinoid aneurysm, B. Sphenoidal ridge meningioma, C. Diabetes mellitus neuropathy, D. Rupture of a supraclinoid aneurysm
D: Rupture of a supraclinoid aneurysm
Answer: D: Rupture of a supraclinoid aneurysm 
Explanation: Ans. Rupture of a supraclinoid aneurysm