Warts are caused by
human papillomavirus.
herpes simplex virus.
adenoviruses.
parvovirus b19.

human papillomavirus.

Explanation:

Warts are common disease which develops on the skin, called skin warts. Warts on the skin caused by the infection of a human papillomavirus (HPV). This virus spread through contact with a contaminated surface. There are about 100 types of HPVs. These viruses infect skin or mucous membrane. The "high risk" type of HPV may be carcinogenic that infect the mucosal tissue of genital area.

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