Answer:
Retro viruses.
Step-by-step explanation:
The central dogma of life explains the flow of genetic information in the living organism. This central dogma was discovered by Crick. The central dogma explains the DNA replication, formation of RNA from DNA (transcription)and proteins from the RNA (translation).
The exception to the central dogma is retroviruses. These viruses has the ability to form the DNA from the RNA by the enzyme reverse transcriptase or reverse teminism.
Thus, the answer is retroviruses.