Which of the following is NOT an example of an obstructive lung disease?

Obstructive lung diseases are characterized by an obstruction of airflow, making it difficult to exhale fully. Conditions such as asthma, chronic obstructive pulmonary disease (COPD), and emphysema specifically involve barriers to airflow due to inflammation, bronchoconstriction, or destruction of lung tissue.

Sarcoidosis, on the other hand, is primarily an interstitial lung disease that involves the formation of granulomas in the lungs and other organs. It is not primarily classified as an obstructive lung disease, as it typically leads to restrictive patterns of lung impairment. In restrictive lung diseases, the lung's ability to expand is compromised, which is not the same mechanism seen in obstructive conditions.

Therefore, sarcoidosis stands out as the option that does not fall under the category of obstructive lung diseases, as it affects lung volume and compliance rather than obstructing airflow during expiration.