Q: 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? A:

Options are: (a). Aids. (b). gonorrhea. (c). syphilis. (d). herpes.
A:
(d).