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Due to increasing air-borne allergens a ...

Due to increasing air-borne allergens a pollutants, many people in urban areas a suffering from respiratory disorder cause wheezing due to:

A

benign growth on mucous lining of nasal cavity

B

inflammation of bronchi and bronchioles.

C

proliferation of fibrous tissues and damage of the alveolar walls.

D

reduction in the secretion of surfactants by pneumocytes

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