Total anomalous pulmonary venous return is a rare congenital defect in which:
A) pressure in the lungs causes pulmonary hypertension.
B) the four pulmonary veins connect to the right atrium.
C) venous blood mixes with arterial blood in the heart.
D) blood returns to the lungs after being reoxygenated.
Answer: B) the four pulmonary veins connect to the right atrium.
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