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': 'Which of the following pneumonia is caused by contaminated air conditioner: \nSelect and explain. \nA. Pneumococci, B. Staphylococci, C. E. coli, D. Legionella', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is. 'd' i. e., Legionella", 'role': 'assistant'}]