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a
Chronic damage to air sacs or alveoli leading to abnormal reduction in respiratory surface area
b
Persistant inflammation and damage to the cells lining the bronchi and bronchioles
c
An allergic reaction causing muscle spasms in the bronchial walls
d
Damage to any Lung tissue causing increase in elasticity of the air sacs
answer is A.
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Detailed Solution
Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major causes of this is cigarette smoking.