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
Ratio of diameter of retinal aeriole to retinal venule is - 
Select and explain. 
A. 3:02, B. 2:03, C. 3:01, D. 1:03
B: 2:03
Answer: B: 2:03 
Explanation: Answer- B. 2:3The ratio has been normally regarded as 2 : 3