<prompt> A elderly male patient presented with fever, chest pain and dry cough, sputum cultured on charcoal yeast medium, the organism is -H. influenzaeMoraxella caarrhalisLegionellaBurkholderia cepacia  <response>: Ans. is c i.e., Legionella . Buffered charcol, yeast extract BCYE agar is a selective media for legionella. . Fever, chest pain and dry cough in an elderly patient with culture positive on charcol yeast medium suggest the diagnosis of legionella infection. 