What is correct for emphysema?

  • A
    Occurs due to only bacteria infection.
  • B
    One of the major causes is cigarette smoking.
  • C
    People working in stone breaking industries are most affected.
  • D
    Inflammation of bronchi and bronchioles.

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Which of the following is a characteristic of emphysema?

Excessive smoking leads to an increase in the concentration of which substance in the blood?

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