This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Legionella, Subject name: Microbiology
Sensitivity of urinary Antigen test of Legionella is? 
Select and explain. 
A. 80%, B. 90%, C. 95%, D. 99%
B: 90%
Answer: B: 90% 
Explanation: ANSWER: (B) 90%REF: Infectious Disease Secrets edited by Robert H. Gates 2nd ed page 5Rapid urinary antigen detection test for L. Pneumophila is a latest test. Sensitivity of the Legionella urinary antigen is 65-90%, with higher sensitivities in patients with severe disease and patients with mild disease whose specimen are concentrated prior to testing. Sensitivity with concentrated urine reaches 90%