Question

they carry deoxygenated blood except for pulmonary vein which carries oxygenated blood"

Answer 1

When this happens, the blood then becomes oxygenated. ... They are still called veins because they transportblood to the heart, regardless of whether or not the blood isdeoxygenated or oxygenated. Similarly, all arteries in the body transport oxygenated blood away from the heart except for the pulmonaryarteries.

Answer 2

I think the answer is pulmonary vein.