Sarcoidosis is a systemic caseating granulomatous disease of unknown cause.

• A. True (caseating)
• B. False (non-caseating)
• C. It is malignant
• D. It is caused by bacteria

Answer: (B)

Noncaseating granulomas are the hallmark of sarcoidosis, a systemic inflammatory disease with an unknown cause. Caseating granulomas, which show central necrosis, are typical of infections like tuberculosis and are not how sarcoid granulomas usually present. Sarcoidosis is not malignant and is not caused by bacteria; its etiology is unknown and thought to involve immune dysregulation with various environmental triggers. Therefore, the statement is not correct—the disease is defined by noncaseating granulomas of unknown cause.