Which of the following vessels carries most of the oxygenated blood?
A) Pulmonary artery
B) Pulmonary vein
C) Coronary artery
D) Coronary vein

Hint: Tubular structures that bring blood through the tissues and organs of the body are blood vessels. Oxygenated blood plays its own role in the growth of cells in the body.

Complete answer:
 Veins are the arteries which carry blood to the heart. Veins are usually known to contain deoxygenated blood, but pulmonary veins hold oxygenated blood. Pulmonary veins are made up of the pulmonary blood flow system. Four main pulmonary veins are present, two of which go from one of the lungs into the left atrium of the heart.

The lungs act as purifiers of blood. There are pulmonary veins in the left atrium of the heart that drain oxygenated blood. From there, the blood is first pumped into the whole body. The pulmonary artery delivers deoxygenated blood from the heart to the lungs for oxygenation. Coronary artery and coronary vein are the vessels supplying blood to and away from the heart.

Additional Information:
Form of vein: It is beneficial for the hepatic vein to remove deoxygenated blood from the liver. In the brain, the hypophyseal portal vein is found, and the renal vein is useful for draining blood from the kidney.

Hence, the correct answer is option (B) Pulmonary vein.

Note: There are two stages of circulation in the whole cardiovascular system; coronary circulation and systemic circulation. Deoxygenated blood is taken out from the right ventricle to the lungs in the pulmonary drainage arteries and returns oxygenated blood to the left atrium and to the heart ventricle. Systemic circulation is the flow of blood from the heart and vice versa to the tissues of the body. The circulation of the lungs is conveniently mixed and compared with the systemic circulation.