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: Medicine
[{'content': 'Interferon-gamma release assays used to diagnose tuberculosis is : \nSelect and explain. \nA. T-SPOT.TB, B. B-SPOT.TB, C. NIGRAs, D. C-SPOT.TB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Two in vitro assays that measure T cell release of IFN with the highly TB-specific antigens ESAT-6 and CFP-10 are available. The T-SPOT.TB is an enzyme-linked immunospot (ELISpot) assay, and the QuantiFERON-TB Gold.', 'role': 'assistant'}]