Viral genome incorporated into host DNA is called:

Options

A. Phage
B. Prophage
C. Bacteriophage
D. none of these

Explanation

To answer the question "Viral genome incorporated into host DNA is called:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Viral Genomes**:
- Viruses have genetic material (DNA or RNA) that can infect host cells. This genetic material is referred to as the viral genome.

2. **Incorporation into Host DNA**:
- When a virus infects a host cell, it can introduce its genetic material into the host's DNA. This process is crucial for the virus to replicate and produce new viral particles.

3. **Terminology**:
- The incorporation of viral DNA into the host genome is a specific process that has a defined term in biology.

4. **Identifying the Term**:
- The term used to describe the viral genome that has been incorporated into the host DNA is "prophage." This term is specifically used when referring to bacteriophages (viruses that infect bacteria).

5. **Conclusion**:
- Therefore, the answer to the question is that the viral genome incorporated into host DNA is called a **prophage**.

### Final Answer:
The viral genome incorporated into host DNA is called a **prophage**.