This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Nerve Disorders, Subject name: Medicine
Cranial nerve most commonly involved in cranial aneurysms? 
Select and explain. 
A. 3rd nerve, B. 4th nerve, C. 5th nerve, D. 6th nerve
A: 3rd nerve
Answer: A: 3rd nerve 
Explanation: ANSWER: (A) 3rd nerveREF: Harrison's 17th ed p. 1727Progressively enlarging cerebral aneurysm involves 3th, nerve completelyMost common nerve to be involved with raised intra cranial tension: 6thMost common nerve to be involved with false localising sign: 6thSaccular aneurysm is the most common type of intracranial aneurysmMost common location: anterior cerebral circulationAneurysms greater than 10 mm in diameter have a roughly 50% risk of bleeding per year