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The answer is D.

 A retrovirus is any of a group of viruses that  characteristically carry their genetic information in form of RNA.  These viruses have an enzyme called reverse transcriptase from which they derive their name because they follow the first step  of the central dogma backward  thus "retro" which means backward.

Reverse transcriptase makes DNA from RNA template  thus reversing the usual pattern of transcribing RNA using DNA as the template.

The central dogma of  molecular genetics  summarizes steps of protein synthesis as DNA → RNA → protein.  But retroviruses have modified the process to be  RNA → DNA → RNA  → protein.


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