Final answer:
The blood vessel that carries oxygenated blood is the A. Pulmonary vein, which is the exception to the rule that veins carry deoxygenated blood. Therefore correct option is A
Step-by-step explanation:
The blood vessel that carries oxygenated blood from the options provided is A. Pulmonary vein. Unlike other veins in the body, the pulmonary veins carry oxygen-rich blood from the lungs to the left atrium of the heart. This is the only exception to the rule that veins carry deoxygenated blood and arteries carry oxygenated blood.
The pulmonary artery, option B, carries deoxygenated blood from the heart to the lungs for oxygenation. The superior vena cava and inferior vena cava, options C and D respectively, carry deoxygenated blood back to the heart from different parts of the body.