<prompt> Answer this question truthfullyWhat is the underlying physiological mechanism of bronchiolitis?  <response>: <reason> Bronchiolitis shows histopathological findings which vary according to different types of bronchiolitis. Bronchiolitis obliterans: Intraluminal polyps protrusions inside the bronchioles with fibroblastic proliferation Inflammatory infiltration Type two pneumocytes lining the alveoli MacrophagesConstrictive bronchiolitis: Scars leading to interluminal narrowing and obstruction Thickening of the airways due to submucosal collagen and fibrosisProliferative bronchiolitis: Histopathology shows Masson bodies fibrotic buds extending into alveoli 