4. Which of the following DNA viruses encodes and carries a reverse transcriptase? (A) Smallpox virus (B) Hepatitis B Virus (C) Epstein-Barr vinus (D) Parvovirus B19

5. Which of the following statements is INCORRECT for retroviruses? (A) They are enveloped RNA virus. (B) They encode reverse transcriptase and replicate through a DNA intermediate. (C) Some of them produce tumors in the infected animals. (D) Retroviruses include human immunodeficiency virus (HIV) which primarily infects CD8 T cells.