<prompt> Regarding diagnostic tests for syphilis, true is all exceptVDRL test is used for measurement of antibody titers to assess response to treatment.FTA-ABS is used to confirm diagnosis in clinically suspected syphilis.TP-PA test is appropriate for population screening for syphilis.Fourfold decrease in titer is required by 6 months after therapy for primary syphilis.  <response>: For population screening for syphilis, VDRL or RPR test is appropriate. 