General Medicine General deab17c2 A patient presents with breathlessness. He has bilateral basal crepitations, lung function tests reveal a decrease in total lung capacity (TLC) and vital capacity (VC) with normal FEV1 /FVC ratio. What is the most likely diagnosis? A Chronic bronchitis B Idiopathic pulmonary fibrosis C Cystic fibrosis D Allergic bronchopulmonary aspergillosis