The 'symptomless' period or latent period in case of syphilis may last for

How many of the following diseases are included in $STDs$?
Gonorrhoea,Syphilis,Genital herpes,Chlamydiasis,Genital warts,Cancer,Trichomoniasis,Hepatitis-$B$,$AIDS$,Typhoid,Malaria

Match the following sexually transmitted diseases (column $I$) with their causative agent (column $II$) and select the correct option.

Column-$I$	Column-$II$
$A$. Gonorrhoea	$i$. $HIV$
$B$. Syphilis	$ii$. Neisseria
$C$. Genital warts	$iii$. Treponema
$D$. $AIDS$	$iv$. Human papilloma virus

$A$ : Diseases or infections which are transmitted through sexual intercourse are collectively called sexually transmitted diseases $(STDs)$.
$R$ : $STDs$,if not properly treated,may lead to pelvic inflammatory diseases,abortion,stillbirth,ectopic pregnancies,infertility,or even cancer of the reproductive tract.

Which pathogen causes genital warts,a type of $STD$ in humans?

Which of the following statements about hepatitis-$B$ is incorrect?