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B
Lung
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C
Atrium
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D
Heart
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Solution
The correct option is B Lung During pulmonary circulation, blood enters from the right atrium into the right ventricle. The right ventricle pumps the blood to the lungs where it gets oxygenated. The oxygenated blood enters the left atrium through the pulmonary veins. From the left atrium blood enters into the left ventricle.