Give reason
Retrovirus is considered to be an exception to the central dogma.

Explanation

To understand why retroviruses are considered an exception to the central dogma of molecular biology, we need to break down the concepts involved.

### Step-by-Step Solution:

1. **Understanding the Central Dogma**:
- The central dogma of molecular biology describes the flow of genetic information in a cell. It is typically represented as:
- DNA → RNA → Protein
- This means that DNA is first transcribed into RNA, and then RNA is translated into proteins.
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