Q. A 58-year-old male was admitted one week ago for fever, malaise, cough, and shortness of breath. He was diagnosed with a consolidated left lower lobe pneumonia (see image) and started on doxycycline for presumed community-acquired pneumonia. His symptoms failed to improve and you ordered pulmonary function testing and a high-resolution chest CT. Spirometry demonstrated airflow obstruction that did not reverse with an inhaled bronchodilator challenge. Additionally, his FEV1 was reduced, and the ratio of FEV1 to forced vital capacity was also reduced. Hyperinflation seen on his CXR was confirmed, and total lung capacity was increased with air trapping suspected. Diffusion capacity was also reduced. HRCT of his lungs revealed bilateral patchy ground glass opacities and a peripherally located left lower lobe consolidation. The radiologist also noted a dense outer rim of consolidation around the focal ground-glass opacity. Today, you have ordered a pulmonary consultation to obtain a lung biopsy. You are also considering an addition to his current pharmacologic therapy. Based on the information you have at this point in time, which of the following therapeutic options is the best choice to add to this patient's regimen?