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
Normal A: V ratio of retinal blood vessels is: 
Select and explain. 
A. 1:02, B. 2:03, C. 3:02, D. 3:04
B: 2:03
Answer: B: 2:03 
Explanation: Ans. 2 : 3