Emphysema is most commonly caused by
Aviral pneumonia in childhood
Bchronic cigarette smoking
Ca single severe asthma attack
Dhigh-altitude residence over months
Answer & Solution
Correct answer: B. chronic cigarette smoking
Emphysema is a chronic obstructive disease in which alveolar walls are destroyed, lowering gas-exchange surface area. Long-term cigarette smoking is overwhelmingly the leading cause; alpha-1 antitrypsin deficiency is rare. Vital capacity drops and residual volume rises.
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