This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'A elderly male patient presented with fever, chest pain and dry cough, sputum cultured on charcoal yeast medium, the organism is - \nSelect and explain. \nA. H. influenzae, B. Moraxella cartarrhalis, C. Legionella, D. Burkholderia cepacia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]