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Asthma may be attributed to

1. bacterial infection of the lungs.
2. allergic reaction of the mast cell in the lungs
3. inflammation of the trachea
4. accumulation of fluid in the lungs

Correct answer: allergic reaction of the mast cell in the lungs

Solution

Asthma is commonly due to an allergic hypersensitivity reaction in the airways, where mast cells release mediators that cause bronchoconstriction and inflammation. This fits the mechanism of asthma better than infection, tracheal inflammation, or fluid buildup.

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