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
True about Legionella pneumoniae is: 
Select and explain. 
A. Gram negative, B. Lungs not effected, C. Gram positive, D. Non motile
A: Gram negative
Answer: A: Gram negative 
Explanation: Gram negative