Which vessel returns oxygenated blood to the heart from the lungs?

The pulmonary vein is the vessel responsible for returning oxygenated blood to the heart from the lungs. The primary function of the pulmonary veins is to carry blood that has been oxygenated in the lungs back to the left atrium of the heart. This contrasts with the pulmonary artery, which carries deoxygenated blood from the heart to the lungs for oxygenation. The aorta, on the other hand, is the major artery that distributes oxygenated blood from the left ventricle to the rest of the body. The superior vena cava is responsible for returning deoxygenated blood from the upper half of the body to the heart. Thus, the pulmonary vein is the correct choice as it directly connects the lungs and the heart, facilitating the transport of oxygen-rich blood necessary for the body's functions.