This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Which one of the following viruses may be human tumor virus? \nSelect and explain. \nA. Epstein-Barr virus (EBV), B. HIV, C. Papillomavirus, D. Varicella-zoster virus (VZV)', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Only two human viruses have been confirmed as human tumor viruses. They include human T-cell lymphoma/leukemia 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.', 'role': 'assistant'}]