Assertion :Emphysema is a chronic disorder in which alveolar walls are damaged. Reason: Emphysema is closely related to cigarette smoking.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Emphysema is a disorder of respiratory system in which there is irreversible distension of the respiratory bronchioles, alveolar sacs and alveoli. The wall separating adjacent alveoli break down and the air remains filled even after expiration.
Hence, assertion is correct.
Smoking causes inflammation of lung alveoli which leads to decrease in surface area for gaseous exchange and causes emphysema.
Hence, reason is also correct.
So, both assertion and reason are correct but reason is not the correct explanation for assertion.
So, the correct answer is B.

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