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: Medicine
The pheonomenon of "sparing off the macula" is due to the collateral circulation between - 
Select and explain. 
A. Middle and posterior cerebral arteries, B. Anterior and middle cerebral arteries, C. Anterior and posterior cerebral arteries, D. Anterior, middle and posterior cerebral artries
A: Middle and posterior cerebral arteries
Answer: A: Middle and posterior cerebral arteries 
Explanation: None