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Option 1: Pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation. This option is correct.
Option 2: Pulmonary veins carry oxygenated blood from the lungs back to the heart. This is not the correct option since the question is asking for the vessel that carries venous blood TO the lungs.
Option 3: A pulmonary arterio-venous shunt is an abnormal connection between the pulmonary artery and vein, causing deoxygenated and oxygenated blood to mix. This is not the correct option as it is not the primary vessel for carrying blood to the lungs.
Option 4: The right ventricle is a chamber of the heart that pumps deoxygenated blood to the pulmonary arteries. It does not directly carry blood to the lungs. Alert - correct answer should be pulmonary arteries (option 1).