Figure shows schematic plan of blood circulation in human with labels $A$ to D. Identify the label and give its function/s

• A

  A-pulmonary vein-takes impure blood from body parts, $\mathrm{pO}_2=60 \mathrm{mmHg}$
• B

  B-pulmonary artery-takes blood from heart to lungs, $\mathrm{pO}_2=90 \mathrm{mmHg}$
• Correct answer
  C

  C-vena cava-takes blood from body parts to right auricle, $\mathrm{pCO}_2=45 \mathrm{mmHg}$
• D

  D-dorsal aorta-takes blood from heart to body parts, $\mathrm{pO}_2=95 \mathrm{mmHg}$

Hence, the correct answer is option: 'C'.