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: Unknown
[{'content': 'Test done for Mycobacterium tuberculosis based on CMI is \nSelect and explain. \nA. IGRA, B. BACTEC, C. Culture, D. GenXpert', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Textbook of Microbiology and Immunology BY Parija. Page. 350\n\xa0\nIGRA\nIGRAs measure a person’s immune reactivity to\xa0M. tuberculosis. White blood cells from most persons that have been infected with\xa0M. tuberculosis\xa0will release interferon-gamma (IFN-g) when mixed with antigens (substances that can produce an immune response) derived from\xa0M. tuberculosis.\nTypes of IGRA\n\nQuantiFERON TB Gold In-Tube test (QFT-GIT);\nT-SPOT.TB\xa0test (T-Spot)', 'role': 'assistant'}]