<prompt> 40 years old male patient came with complaint of dry cough and dyspnoea. On lung function tests, restrictive pattern of decreases lung function is seen. Chest x-ray showed few reticular opacities in bilateral lung. HRCT of lung was performed which shows GGO in bilateral lung fields sparing sub-pleural region. Most probable diagnosis isUIPNSIPHypersensitivity pneumonitisRespiratory bronchiolitis  <response>: Interstitial Lung Disease UIP Usual interstitial pneumonia NSIP Non - specific interstitial pneumonia Reticular opacities Traction bronchiectasis Subpleural honeycombing Subpleural sparing 