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Which of the following are true regarding silicosis?
a) It predominantly affects the lower lobes in acute silicoproteinosis
b) It mimics sarcoidosis on high resolution computed tomography (HRCT)
c) Emphysema is associated with the development of progressive massive fibrosis
d) It is a more frequent cause of nodal egg-shell calcification on radiograph than
coal miner’s pneumoconiosis
e) Impairment of the lung function test correlates best with the profusion of nodules

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