<prompt> Which of the following statement are not related to pathogenesis of idiopathic pulmonary fibrosis?SmokingAge less than 20 yearsLoss of function mutation in TE and TERC geneMutations in genes encoding components of surfactant  <response>: Idiopathic pulmonary fibrosis aka Cryptogenic fibrosing alveolitis It is characterized by recurrent alveolar epithelial injury. SMOKING is one of the most impoant etiological factor. Seen in patient more than 50 years It is also associated with altered activity of surfactant. Histopathological Hallmark -Usual interstitial Pneumonia Rx-Lung transplant 