Which of the following is not correctly paired with its description?

• A

  Ventilation : Drawing of atmospheric air into the lungs and releasing CO₂-rich alveolar air outside

• B

  Cellular respiration : Utilisation of O₂ by the cells for anabolic reactions

• C

  Pleural fluid : Reduces friction on the lung surface

• D

  Spirometer : Used for measuring the volume of air involved in breathing