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': 'True about Legionella pneumoniae is: \nSelect and explain. \nA. Gram negative, B. Lungs not effected, C. Gram positive, D. Non motile', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gram negative', 'role': 'assistant'}]