<prompt> Answer this question truthfullyCould you provide me with the phrase that you want to be rephrased in proper English?  <response>: <reason> Idiopathic pulmonary fibrosis is a disease among a large group of the interstitial lung diseases and particularly a subtype of the idiopathic interstitial pneumonia. The major group include acute interstitial pneumonia AIP, cryptogenic organizing pneumonia COP, respiratory bronchiolitis interstitial lung disease RB-ILD, and desquamative interstitial pneumonia DIP. 