Which of the following is an important detection technique for syphilis?

What measures should be taken to avoid the transmission of $STD$s?
$I$. Avoid sex with unknown partners
$II$. Avoid sex with multiple partners
$III$. Use protection during sex
$IV$. Avoid sharing needles

Match the sexually transmitted diseases in Column-$I$ with their causative agents in Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$A$. Gonorrhoea	$1$. $HIV$
$B$. Syphilis	$2$. $Neisseria$
$C$. Genital herpes	$3$. $Treponema$
$D$. $AIDS$	$4$. $Herpes$ $simplex$ $virus$

Which of the following diseases are completely curable if detected early and treated properly?
$I -$ Gonorrhoea,$II -$ Syphilis,$III -$ Genital herpes,$IV -$ Chlamydiasis,$V -$ Genital warts,$VI -$ Trichomoniasis,$VII -$ Hepatitis-$B$,$VIII -$ $AIDS$

Syphilis is caused by:

Sexually transmitted diseases $(STDs)$ cannot be transmitted easily during the use of which of the following?