Select the INCORRECT statement.

Options

A. Most plant viruses are RNA viruses.
B. Bacteriophages possess dsDNA.
C. Immunodeficiency virus is a retrovirus.
D. Prisons possess only nucleoid and no proteins.

Answer

To solve the question of selecting the INCORRECT statement, we will analyze each statement provided in the question:

1. **Most plant viruses are DNA viruses.**
- This statement is incorrect. Most plant viruses actually have RNA as their genetic material, not DNA. Therefore, this statement is likely to be the incorrect one.

2. **Bacteriophages possess double-stranded DNA.**
- This statement is correct. Bacteriophages, which are viruses that infect bacteria, typically have double-stranded DNA as their genetic material.

3. **Immunodeficiency virus is a retrovirus.**
- This statement is also correct. The Human Immunodeficiency Virus (HIV) is classified as a retrovirus, which means it has RNA as its genetic material and replicates through a DNA intermediate.

4. **Pyrons possess only nucleoid and no proteins.**
- This statement is incorrect. Prions are infectious agents composed solely of protein and do not contain nucleic acids (DNA or RNA). Therefore, this statement is misleading as it suggests that prions have nucleoid, which they do not.

After analyzing all the statements, we find that the first statement about plant viruses being DNA viruses is incorrect.

### Step-by-Step Solution:
1. **Identify the statements given in the question.**
2. **Analyze each statement for its correctness.**
3. **Determine that the first statement about plant viruses is incorrect.**
4. **Conclude that the correct answer to the question is the first statement.**

### Final Answer:
The INCORRECT statement is: "Most plant viruses are DNA viruses."