Final answer:
The pulmonary vein is the vessel that carries oxygenated blood, which is unique among veins as they typically carry deoxygenated blood. option b.
Step-by-step explanation:
The vessel that carries oxygenated blood is the pulmonary vein. Contrary to most other veins in the human body, pulmonary veins carry oxygen-rich blood from the lungs back to the left atrium of the heart. This makes the pulmonary veins unique as they are the only veins that transport oxygenated blood. Other vessels mentioned, like the superior vena cava, inferior vena cava, and pulmonary artery generally carry deoxygenated blood. Contrary to most other veins in the human body, pulmonary veins carry oxygen-rich blood from the lungs back to the left atrium of the heart.