This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infection, Subject name: Medicine
[{'content': 'Pontiac fever is caused by: \nSelect and explain. \nA. Marbug virus, B. Legionella, C. Tuberculosis bacilli, D. Sindbis virus', 'role': 'user'}, {'content': "Answer: B \nExplanation: - Legionellosis- Pontiac fever & Legionnaires' disease Pontiac fever is an acute, febrile, self-limited illness that has been serologically linked to Legionella species Legionnaires' disease is pneumonia caused by these species.", 'role': 'assistant'}]