Identify the sexually transmitted disease caused by bacteria.

In case of a person suffering from syphilis, the chancre formation occurs during

Which of the following principles are used to prevent $STD$ infection?
$(i)$ Avoid sex with unknown partners
$(ii)$ Use condoms during coitus
$(iii)$ Blood transfusion
$(iv)$ All of these

What is the full form of $PID$?

Match the columns:

Column $I$	Column $II$
$(a)$ $AIDS$	$(w)$ Trichomonas vaginalis
$(b)$ Gonorrhoea	$(x)$ Treponema pallidum
$(c)$ Syphilis	$(y)$ $HIV$
$(d)$ Trichomoniasis	$(z)$ Neisseria gonorrhoeae

Which of the following is not an example of a sexually transmitted disease $(STD)$?