<prompt> Which of the following is the characteristic feature of adult respiratory distress syndrome?Diffuse alveolar damageInterstitial tissue inflammationAlveolar exudatesInterstitial fibrosis  <response>: Adult Respiratory Distress Syndrome ARDS Also called as Shock Lung, Diffuse alveolar damage or Acute lung injury In adult respiratory distress syndrome, there is damage to type-I II pneumocytes as well as formation of hyaline membrane due to endothelial cell damage which increases vessel permeability - formation of membrane with fibrinogen-Hyaline appearance. The histologic manifestation of ARDS in the lungs is known as diffuse alveolar damage DAD the integrity of the alveolar-capillary membrane is compromised by endothelial and epithelial injury. 