Multiple choice Which of the following viruses cause tumor in humans? Epstein Barr virus HIV Papilloma virus Varicella-Zoster virus Phage virus Reveal answer Fill a bubble to check yourself C Correct answer Explanation There are only two types of viruses that have been proved to be responsible for tumors in humans. They are Tcell lymphoma/ leukaemia virus(HTLV) and papillomavirus.