Q.

Which vein brings clean blood from the lungs into the heart?

A. Renal Vein
B. Pulmonary Vein
C. Vena Cava
D. Hepatic Vein
Answer» B. Pulmonary Vein
Explanation: The pulmonary veins are a set of veins that deliver clean oxygenated blood from the lungs to the heart. It brings oxygen-rich blood to the left atrium. Systemic veins deliver deoxygenated blood to the heart.
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