Answer and Explanation 9

9.  D is the correct answer.  The patient has a restrictive lung disease pulmonary pattern with moderately impaired diffusion capacity.  He need referred to pulmonary rehab and to be referred to pulmonary for bronchoscopy.  He likely has pulmonary fibrosis.  This patient is not going to have any significant response to prednisone, albuterol, glucocorticoids, or singular as documented by his PFT's.