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
Which of the following nerve is first affected in berry aneurysm: 
Select and explain. 
A. 3 rd nerve, B. 4th nerve, C. 5th nerve, D. 6th nerve
A: 3 rd nerve
Answer: A: 3 rd nerve 
Explanation: Ans.(a) 3rd nerveRef: Harrison 19th ed. /1784-85* Most common cranial nerve affected in unruptured berry aneurysm is the 3rd cranial nerve which will present as ipsilateral ptosis, diplopia and strabismus.