This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Bilateral hilar lymphadenopathy with non-caseating granuloma is seen in - \nSelect and explain. \nA. TB, B. Lymphoma, C. Sarcoidosis, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sarcoidosis \n\nSarcoidosis is an immune system disorder characterized by the presence of non-caseating granulomas.\nThe cause of the disease is still unknown.\nVirtually any organ can be affected, however, granulomas most often appear in the lung or the lymph nodes →\xa0Bilateral hilar lymphadenopathy or lung involvement is visible on chest radiograph in 90% of cases.\n\nHistology\n\nHistologically involved tissues show the classical non-caseating granulomas, composed of an aggregate of tightly clustered epithelioid cells, often with Langhans or foreign body type giant cells. Central necrosis is unusual → noncaseating.\nGranulomas also contain.\n\ni.\xa0Schaumann bodies → Laminated concretions composed of calcium and proteins.\nii.\xa0Asteroid bodies\xa0 → Stellate inclusions within giant cells.', 'role': 'assistant'}]