This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'An elderly patient presented with fever, chest pain and dry cough. Sputum cultured on charcoal yeast medium, the most likely organism is: \nSelect and explain. \nA. H. influenzae, B. Moraxella catarrhalis, C. Legionella, D. Burkholderiacepacia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Legionella.Ref: Harrison, 19th/e, p. 1014; Ananthanarayan, 9th/e, p. 401Clinical features of legionella infection (Legionnaire disease) is very similar to other types of pneumonia (lung infection), with symptoms that include - Diarrhea, High grade fever, Cough, Shortness of breath, Muscle aches, Headaches.It's a triad of Pneumonia, diarrhea and encephalitis", 'role': 'assistant'}]