Case Study: 57-year-old Caucasian female in good functional status with 2 to 4 week history of dyspnea on exertion, dry cough, desaturation, and low grade fever

The diagnosis of BOOP (now called Cryptogenic Organizing Pneumonia or COP) is unequivocally established by:

a) History and physical examination
b) Transbronchial lung biopsy
c) HRCT
d) Surgical lung biopsy