Which diagnostic test is specifically used to detect Treponema pallidum?

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Venereal Disease Research Laboratory (VDRL) testKahn's serological testTreponema pallidum hemagglutination assay (TPHA)Widal diagnostic testRapid plasma reagin (RPR) test

Explanation

Among the listed tests, the Treponema pallidum hemagglutination assay (TPHA) is the specific test designed to identify antibodies against Treponema pallidum, the bacterium responsible for syphilis. VDRL and Kahn's test are non-treponemal tests used for screening, while the Widal test is for typhoid diagnosis.