Which among the following carries impure blood to human heart?

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Q: 277 (SSC/NA)
Which among the following carries impure blood to human heart?
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,1,9,4,3,1,2

keywords: 

{'pulmonary arteries': [1, 0, 1, 0], 'impure blood': [1, 0, 0, 0], 'pulmonary vein': [2, 0, 1, 1], 'aorta': [4, 0, 3, 0], 'human heart': [3, 0, 0, 0], 'vena cava': [3, 0, 0, 0]}