Main artery distributing oxygenated blood to body.

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The main artery that distributes oxygenated blood to the body is the aorta. It carries oxygen-rich blood from the left ventricle into the systemic circulation, branching out to supply tissues throughout the body. Veins return blood to the heart and do not deliver oxygen to the body. Capillaries are the tiny vessels where oxygen is exchanged with tissues, so they’re the sites of exchange rather than the main distributor. The pulmonary artery, while an artery, carries blood to the lungs and it is deoxygenated, not oxygenated. So, the aorta is the correct choice.