This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
[{'content': 'In first 8 weeks of syphilis the most specific test is \nSelect and explain. \nA. VDRL, B. Kahn, C. TPI, D. FTA-ABS', 'role': 'user'}, {'content': "Answer: D \nExplanation: The fluorescent treponemal antibody absorption (FTA-ABS) test is a blood test that checks for the presence of antibodies to Treponema pallidum bacteria(during first 8weeks of infection). These bacteria cause syphilis. Syphilis s a sexually transmitted infection (STI) that's spread through direct contact with syphilitic sores. Ref Harrison20th edition pg 1234", 'role': 'assistant'}]