Complete the analogy
Humans : DNA :: viroids :: ?

Options

A. DNA
B. RNA
C. DNA or RNA
D. Proteins

Answer

To solve the analogy "Humans : DNA :: viroids : ?", we need to identify the relationship between the first pair (humans and DNA) and then apply that relationship to the second pair (viroids and the unknown).

### Step-by-Step Solution:

1. **Identify the Relationship**:
- Humans possess DNA as their genetic material. DNA carries the hereditary information necessary for growth, development, and reproduction in humans.

2. **Understand Viroids**:
- Viroids are small infectious agents that primarily affect plants. They are composed of a short strand of RNA and do not have a protein coat, which distinguishes them from viruses.

3. **Determine the Genetic Material of Viroids**:
- Since humans have DNA as their genetic material, we need to find out what viroids have. Viroids are known to have RNA as their genetic material.

4. **Complete the Analogy**:
- Given that humans have DNA, and viroids have RNA, we can complete the analogy as follows:
- Humans : DNA :: viroids : RNA

### Final Answer:
The answer is RNA.