Fact 1: Veins generally carry deoxygenated blood.

Fact 2: Arteries and veins are blood vessels.

Given the two facts above, answer the question "Vessels carry deoxygenated what?" with the following options: 
- glucose
 - oxygen
 - Joules
 - liquid
 - organs
 - molecules
 - atoms
 - blood


 

        blood 