Concept:Oxygenated blood returns from the lungs to the heart through the pulmonary veins.
Explanation:The heart receives oxygenated blood from the lungs via the pulmonary veins, which empty into the left atrium.
Most veins carry deoxygenated blood, but the pulmonary vein is the exception.
In contrast, most arteries carry oxygenated blood, except the pulmonary artery, which carries deoxygenated blood to the lungs.
The anterior and posterior vena cavae carry deoxygenated blood from the body into the right atrium.
Therefore, the pulmonary vein is the vessel that brings oxygenated blood into the heart.
Answer:C. Pulmonary vein