Passage: Histoplasmosis (also known as "cave disease", "Darling's disease", "Ohio valley disease", "reticuloendotheliosis", "spelunker's lung" and "caver's disease") is a disease caused by the fungus Histoplasma capsulatum. Symptoms of this infection vary greatly, but the disease affects primarily the lungs. Occasionally, other organs are affected; this is called disseminated histoplasmosis, and it can be fatal if left untreated.

Question: what will cause someone to get cave disease?
the fungus Histoplasma capsulatum.