A subject has a DLCOsb of 10.2 ml CO/min/mm Hg (STPD),which is 51% of her predicted value.Her DL/VA ratio is 4.1.Which of the following diagnoses is most consistent with these values?
A) Pulmonary emphysema B) Pulmonary resection C) Cystic fibrosis D) COHb of 5.5%