A 56-year-old man comes to the physician for a 12-month history of unexplained dry cough. He has no past medical history. X-ray of the chest shows a reticulonodular pattern. Auscultation shows diffuse bilateral dry crackles. High-resolution CT of the chest is performed. Which of the following is the most appropriate pharmacologic therapy for this patient?
Dornase-alfa
Epoprostenol
Guaifenesin
Nifedipine
Pirfenidone
