<prompt> The most likely cause of bihilar lymphadenopathy isHistoplasmosisTuberculosisSarcoidosisAspergillosis  <response>: Sarcoidosis Chronic multisystem disorder of unknown cause characterized by accumulation of TH 1 lymphocytes and mononuclear phagocyte in various tissuesof body.Non-caseating sarcoid Granuloma in affected organsLungs 90Lymph nodesSkinOthersInterstitial lung disease fibrosis of lung parenchymaPleura is involved, in 1-5 cases unilateral pleural effusion Cavitation is rare BL hilar lymphadenopathy is the hallmark of Sarcoidosis BL parotid enlargement Erythema nodosum Lupus pernio purple blue shiny swollen lesion on nose, cheeks, lips, earsUveitisRenal hypercalcemia with or without hypercalciuriaAhritisPeripheral neuropathyCor-pulmonaleRefer: Harrisons Principles of Internal Medicine, 18th edition, pg no: 2805-2813 