The correct blood vessels are
A-Vena cava. It brings unoxygenated blood from body to heart.
B-Pulmonary artery. It receives blood from right ventricle and carries it to lungs for gaseous exchange.
C-Pulmonary vein. It returns oxygen rich blood from lungs to left atrium.
D-Aorta. It takes oxygenated blood from left ventricle to the body parts.
b) P & Q = Deoxygenated and R& S = oxygenated
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Observe the folloTamil Nadu Board - Science