The correct answer is A. Lungs.

Sarcoidosis is a non-infectious granulomatous disorder of unclear etiology. The lungs are the most common site of extracutaneous involvement (~90% of cases).

Sarcoidosis involves the following organ systems at the listed rates: lymph nodes (75-90%), eyes (25%), nasal mucosa (20%), bone marrow (25-40%), and liver (15-40%).

References:

PMID: 27378039

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