The following diagram shows a schematic outline of human blood circulation. Identify the blood vessels $P, Q$ and $R$.

  • A
    Pulmonary vein,Pulmonary artery,Vena cava
  • B
    Pulmonary artery,Pulmonary vein,Aorta
  • C
    Pulmonary artery,Pulmonary vein,Vena cava
  • D
    Pulmonary vein,Pulmonary artery,Aorta

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