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Which one of the following shows the CORRECT order of blood flow in the heart?
A. Vena cava-->pulmonary artery-->pulmonary vein--->aorta
B. Pulmonary artery-->vena cava-->pulmonary vein--->aorta.
C. Pulmonary vein->aorta-->pulmonary artery—>vena cava.
D. Aorta-->pulmonary vein-->vena cava-->pulmonary artery.