This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Interstitial lung diseases, Subject name: Pathology
Which of the following statement are not related to pathogenesis of idiopathic pulmonary fibrosis? 
Select and explain. 
A. Smoking, B. Age less than 20 years, C. Loss of function mutation in TE and TERC gene, D. Mutations in genes encoding components of surfactant
B: Age less than 20 years
Answer: B: Age less than 20 years 
Explanation: 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