Select the correct statement.

Options

A. Viroids have double stranded RNA
B. RNA of viroids have high molecular weight than viruses
C. Mumps and Herpes are viral diseases
D. The name virus was given by D.J. Ivanowsky

Answer

To solve the question of selecting the correct statement regarding viroids and viruses, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Viroids**: Viroids are the smallest infectious pathogens known. They are distinct from viruses in that they lack a protein coat.

**Hint**: Remember that viroids are simpler than viruses and do not have a protective protein layer.

2. **Genetic Material of Viroids**: The genetic material of viroids is single-stranded RNA. This is a key characteristic that differentiates them from many viruses, which can have either single-stranded or double-stranded RNA or DNA.

**Hint**: Focus on the type of genetic material when distinguishing viroids from viruses.

3. **Molecular Weight of Viroids**: Viroids have a low molecular weight, which is lower than that of many viruses. This statement is incorrect if it claims otherwise.

**Hint**: Consider the size and complexity of viroids compared to viruses when thinking about molecular weight.

4. **Viral Diseases**: The statement regarding mumps and herpes being viral diseases is correct. Both are caused by viruses, with herpes affecting the mouth and genital areas, and mumps primarily affecting the throat.

**Hint**: Recall that both mumps and herpes are well-known viral infections.

5. **Origin of the Term "Virus"**: The name "virus" was given by Martinus Beijerinck, not DJ Ivanovsky. This statement is incorrect.

**Hint**: Remember the historical context of virology and the contributions of key scientists.

### Conclusion:
Based on the analysis of the statements, the correct statement is that mumps and herpes are viral diseases.

### Final Answer:
The correct statement is: "Mumps and herpes are viral diseases."