<prompt> The most likely cause of bi-hilar lymphadenopathy isHistoplasmosisTuberculosisSarcoidosisAspergillosis  <response>: SarcoidosisChronic multisystem disorder of unknown cause characterized by the accumulation of TH 1lymphocytes and mononuclear phagocytes in various tissues of the 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 perniopurple-blue shiny swollen lesion on nose, cheeks, lips, earsUveitisRenal hypercalcemia with or without hypercalciuriaAhritisPeripheral neuropathyCor-pulmonaleRefer: Harrisons Principles of Internal Medicine, 18thedition, pg no: 2805-2813 