Tobacco smoke contains carbon monoxide,which

  • A
    Reduces the oxygen-carrying capacity of blood
  • B
    Causes gastric ulcers
  • C
    Raises blood pressure
  • D
    Is carcinogenic

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Select the correct option:
$(1)$ Nasal cavity acts as an air conditioner.
$(2)$ Cigarette smoke causes emphysema.

Increased asthmatic attacks in certain seasons are related to

All of the following are diseases of the lungs,except:

''Emphysema'' is a condition in which.....

Chronic respiratory disorders like $.......$ are caused by pollen grains.

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