$A$ sexually transmitted disease, symptomatized by the development of ulcers on the genitals, is caused by the infection of

Define the location and function of the following: Copper-$T$ and Neisseria gonorrhoeae.

$STDs$ caused by bacteria is/are:

Syphilis is an infectious bacterial disease caused by $Treponema\ pallidum$ with $3$ stages:
$(A)$ Infectious painless ulcers on the genitals $\quad(i)$ First
$(B)$ Blindness, heart trouble, aortic impairment $\quad(ii)$ Second
$(C)$ Skin lesions, hair loss, swollen joints $\quad(iii)$ Third
Which of the following is the correct match between the symptoms and stage?

Syphilis is a sexually transmitted disease caused by which of the following?

Select the option that includes only sexually transmitted diseases.