57. A patient presents with breathlessness and occasional dry cough. On physical examination, he is found to have bilateral basal crepitations. His pulmonary function tests reveal a decrease in total lung capacity and vital capacity(VC), with normal FEV1/FVC ratio. He is most likely suffering from:

(a) Chronic bronchitis
(b) Idiopathic pulmonary fibrosis
(c) Cystic fibrosis
(d) Allergic bronchopulmonary aspergillosis

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