This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
Choose the appropriate lettered structure in this angiogram of the cerebral vasculature and collateral circulations are discounted. Aneurysm of which artery causes a perichiasmal lesion that may cause nasal hemianopia? 
Select and explain. 
A. A, B. B, C. C, D. D
D: D
Answer: D: D 
Explanation: (d) Nasal hemianopia is blindness in the nasal field of vision of the eye because of a perichiasmal lesion such as an aneurysm of the internal carotid artery.