Which one is known as a “Friend of farmers"?

Options

A. Rana
B. Cockroach
C. Pheretima
D. Rat

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the organism known as the "Friend of Farmers." This implies we need to identify an organism that positively contributes to agriculture and soil health.

2. **Analyzing the Options**: The options provided likely include various organisms. We need to evaluate each one to determine which has a beneficial role in farming.

3. **Evaluating Each Organism**:
- **Frog (Rana)**: Frogs are generally not considered beneficial to farming as they do not contribute positively to soil health or crop production.
- **Cockroach**: Cockroaches are known to spread diseases and do not help in enhancing soil quality or crop yield.
- **Earthworm**: Earthworms play a crucial role in soil health. They break down complex organic matter into simpler forms, enhancing soil fertility and structure, which is beneficial for crop growth.
- **Rat**: Rats are pests that can damage crops and spread diseases, making them detrimental to farming.

4. **Identifying the Correct Answer**: Based on the evaluation, the earthworm is recognized for its positive impact on soil quality and crop production, thus it is known as the "Friend of Farmers."

5. **Conclusion**: The organism known as the "Friend of Farmers" is the earthworm.

### Final Answer:
The "Friend of Farmers" is the Earthworm.