This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sarcoidosis, Subject name: Medicine
A 30-year-old African-American woman presents with bilateral hilar lymphadenopathy and reticular densities in both lung fields. Which of the following is a defining characteristic of the disorder suggested by these findings? 
Select and explain. 
A. Noncaseating granulomas, B. Hypocalcemia, C. Impaired synthesis of immunoglobulin, D. Caseation and necrosis may occur
A: Noncaseating granulomas
Answer: A: Noncaseating granulomas 
Explanation: The clinical picture strongly suggests a diagnosis of sarcoidosis. The granulomas of sarcoidosis are characteristically noncaseating. Sarcoidosis is a multisystem disorder. Common findings include anergy to tuberculin, hypercalcemia, and broad-based polyclonal hypergammaglobulinemia. Sarcoidosis : Significant elevation of angiotensin-conveing enzyme (ACE).