This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
[{'content': 'Confirmatory test for syphilis:- \nSelect and explain. \nA. VDRL, B. FTAABS, C. RPR, D. Kahn test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Confirmatory/Specific/Treponemal tests: Specific antibodies are detected by using T.pallidum antigens TPI (Treponema pallidum immobilization test): Uses live T.pallidum FTA-ABS (Fluorescent treponemal antibody absorption test): Uses killed T.pallidum TPA (T.pallidum agglutination test): Uses killed T.pallidum TPIA (T.pallidum immune adherence test): Uses killed T.pallidum TPHA (T.pallidum hemagglutination test): Uses antigenic extract of T.pallidum', 'role': 'assistant'}]