Genital herpes is most commonly caused by

herpes simplex virus 1.

varicella-zoster virus.

herpes simplex virus 2.

cytomegalovirus.

The correct option is : herpes simplex virus 2

Explanation:

Genital herpes is a serious medical condition which is caused by the infection by the herpes simplex virus. It is a very common sexually transmitted disease.

Herpes simplex virus is of two types: herpes simplex virus 1 and 2.

The Herpes simplex virus 2 is the most common cause of genital herpes, which produces sores around the genitals or the rectum area.