Answer the following question given this paragraph: 

This lip blister, or cold sore, is caused by a herpes virus. The virus is closely related to the virus that causes genital herpes. The genital herpes virus causes similar blisters on the genitals. If you’ve ever had a cold sore, you know how painful they can be. Genital herpes blisters are also painful.


Q: What type of virus can cause painful sores on the mouth and genitals?

 Choices:

- Aids

- gonorrhea

- syphilis

- herpes

A:
herpes
