(during this discussion I would use a diagram of the hear to point out appropriate parts)
The Aorta is the body's largest artery, It carries oxygenated blood from the Left verntricle to the body.
The superior vena cava is a vein that brings deoxygenated blood from the body to the heart.
The inferior vena cava carries de-oxygenated blood from the body to the heart.
The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.
The pulmonary vein carries oxygenated blood from the lungs to the left atrium.