<prompt> BAL of a patient shows foamy macrophages with decreased CD4: CD8 ratio. What is the diagnosis?SarcoidosisHypersensitivity pneumonitisOrganising pneumoniaDiffuse alveolar hemorrhage  <response>: Organising pneumonia Foamy macrophages in BAL with low CD4: CD8 ratio Hypersensitivity pneumonitis Marked lymphocytosis Sarcoidosis Marked lymphocytosis with CD4: CD8 ratio of 3.5 Diffuse alveolar hemorrhage Hemosiderin laden macrophages 