A treponemal test is done to diagnose:

Correct option is B

Ans. (b) Sol. The correct answer is (b) Syphilis.
A treponemal test is a diagnostic test used to detect syphilis, which is caused by the bacterium Treponema pallidum. These tests detect antibodies to the bacteria, and they are part of a series of tests used to diagnose syphilis and confirm the presence of the infection.
Explanation of each option:
· (a) AIDS: AIDS is caused by the HIV virus, and its diagnosis involves tests for HIV antibodies or the virus itself, not treponemal tests.
· (b) Syphilis: Correct answer. Treponemal tests, such as the Treponema pallidum particle agglutination (TPPA) test, are used specifically to diagnose syphilis, a sexually transmitted infection caused by Treponema pallidum.
· (c) Gonorrhoea: Gonorrhoea is caused by the bacterium Neisseria gonorrhoeae, and its diagnosis involves tests like nucleic acid amplification tests (NAATs), not treponemal tests.
· (d) Chlamydiasis: Chlamydia is caused by the bacterium Chlamydia trachomatis, and its diagnosis is typically done using NAATs, not treponemal tests.
Thus, treponemal tests are used to diagnose syphilis.