Answer the following question given this paragraph: 

Further away from the heart, the aorta branches into smaller arteries, which eventually branch into capillaries. Capillaries are the smallest type of blood vessel; they connect very small arteries and veins. Gases and other substances are exchanged between cells and the blood across the very thin walls of capillaries.


Q: What are the smallest type of blood vessel?

 Choices:

- varicose veins

- spider veins

- arteries

- capillaries

A:
capillaries
