Which one of the following is the correct statement for respiration in humans?

  • A
    Cigarette smoking may lead to inflammation of bronchi.
  • B
    Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.
  • C
    Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
  • D
    About $90\%$ of carbon dioxide $(CO_2)$ is carried by haemoglobin as carbamino-haemoglobin.

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