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
All are oncogenic viruses except- 
Select and explain. 
A. HBV, B. HPV, C. EBV, D. VZV
D: VZV
Answer: D: VZV 
Explanation: Ans. is 'd' i.e., VZV o Many viruses have been implicated in the causation of cancers :A) RNA viruses# All oncogenic RNA viruses belong to family retroviriadae (retroviruses).# Important examples are Avian leukosis virus, murine leukosis virus, murine mammary tumor virus, HIV (causing AIDS related malignancies) and Human-T-cell leukemia virus (causing Adult T-cell leukemia).B) DNA viruses# DNA viruses causing cancers are1) Papillomaviridae (HPV): Causes genital tumors, SCC and oropharyngeal carcinoma.2) Herpesviridae : These viruses are :i) HSV-2: Causes cervical carcinoma.ii) EBV: Causes nasopharyngeal carcinoma and Burkitt's lymphoma.iii) HHV-8: It causes Kaposis sarcoma.3) Hepadnaviridae (HBV): It causes hepatocellular carcinoma.4) Flaviviridae (HCV): It causes hepatocellular carcinoma.