Which of the following is a retro virus

Options :
  1. variola virus
  2. vericella virus
  3. HIV
  4. all the above

Answer and Explanation :-

Answer: Option 3


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Jayden laughed grimly. 'Press the attack and hope for the best.''Hope is not a strategy,' said Kira'It's not plan A,' said Jayden, 'and it shouldn't be plan B, but it is every plan C that has ever been made.
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