<prompt> Which one of the following viruses may be human tumor virus?Epstein-Barr virus EBVHIVPapillomavirusVaricella-zoster virus VZV  <response>: Only two human viruses have been confirmed as human tumor viruses. They include human T-cell lymphomaleukemia virus HTLV and papillomavirus. Others, such as EBV, HSV, and hepatitis B and C, have been implicated as tumor viruses. The virus that causes chicken pox VZV is not know to be oncogenic. 