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
Female patient with bilateral hilar lymphadenopathy and joint pain. ACE levels are elevated. The diagnosis in this patient is 
Select and explain. 
A. Silicosis, B. Hodgkin lymphoma, C. Sarcoidosis, D. Non Hodgkins lymphoma
C: Sarcoidosis
Answer: C: Sarcoidosis 
Explanation: Sarcoidosis is a multisystem granulomatous disorder of unknown aetiology characterised by presence of non caseating granulomas. LOFGREN SYNDROME - an acute illness characterised by erythema nodosam, peripheral ahropathy, uveitis, bilateral hilar lymphadenopathy,lethargy and fever often seen in young women. Bilateral hilar lymphadenopathy may be sometimes discovered incidentally on chest x-ray . Ref Davidson edition23rd pg 608