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
The retinal capillaries are distinguished by having all, except: 
Select and explain. 
A. Widening of the capillary calibre in the periphery, B. Capillary free zone around the veins, C. Superficial network, D. Deep denser network
B: Capillary free zone around the veins
Answer: B: Capillary free zone around the veins 
Explanation: Ans. Capillary free zone around the veins