<prompt> Answer this question truthfullyWhat stain is used to identify the fungus Pneumocystis jirovecii in Pneumocystis Pneumonia from the bronchoalveolar lavage BAL sample?  <response>: <reason> The methenamine silver stain is used to identify the fungus Pneumocystis jirovecii in Pneumocystis Pneumonia from the bronchoalveolar lavage BAL sample. 