Robert Bradley wrote:Something about it not carrying oxygenated blood?
Yes - Arteries carry blood away from the heart and veins return the blood to the heart. Arteries generally carry oxygenated blood whilst veins carry de-oxygenated blood. However, the pulmonary vessels run between the heart and the lungs. The de-oxygenated blood travels from the heart to the lungs where it becomes oxygenated then returns to the heart via the pulmonary vein from where it gets pumped around the rest of the body.
So, the pulmonary artery is the only artery to carry de-oxygenated blood. So the answer is correct.