This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'The most likely cause of bihilar lymphadenopathy \nSelect and explain. \nA. Histoplasmosis, B. Tuberculosis, C. Sarcoidosis, D. Aspergillosis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Sarcoidosis is a multi system granulomatous disorder of unknown etiology characterised by the presence of non-caseating granulomas.The definitive feature of Sarcoidosis in a chest X ray is bilateral hilar lymphadenopathy.Lofgren's syndrome is an acute illness characterised by erythema nodosum,peripheral ahropathy,uveitis,bilateral hilar lymphadenopathy,lethargy and occasionally fever. Reference:Davidson' s Medicine-22 nd edition,page no:710 & Harrison", 'role': 'assistant'}]