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
All the following are true about IGRA 
(Interferon gamma release assays) except. 
Select and explain. 
A. Differentiates active and latent TB, B. Also called quantiferon TB gold assay, C. Alternative to tuberculin skin test, D. Urine is used as sample
D: Urine is used as sample
Answer: D: Urine is used as sample 
Explanation: Blood is the sample used in IGRA.