What type of staining should be applied to the bronchoalveolar lavage to demonstrate the organism?

A 39-year-old man with HIV is admitted due to shortness of breath. Chest x-ray shows bilateral pulmonary infiltrates and Pneumocystis carinii pneumonia is suspected. What type of staining should be applied to the bronchoalveolar lavage to demonstrate the organism?

A. Rubeanic acid
B. Silver stain
C. Pearl’s stain
D. Rose Bengal