Answer :
A virus consisting of a single strand of RNA, which is reverse transcribed into complementary DNA, is referred to as a retrovirus. Thus, option B is correct.
What is virus?
A virus is a microscopic organism that causes serious diseases and they are only active and alive when they enter into host body.
The structure of virus is very simple and the virion contains single molecule of nucleic acid which is covered by a coat of protein known as capsid.
The viruses may contain DNA or RNA any one of them. They never contain both DNA as well as RNA and its nucleic acid is either single stranded or double stranded.
Therefore, a virus consisting of a single strand of RNA, which is reverse transcribed into complementary DNA, is referred to as a retrovirus. Thus, option B is correct.
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