In earthworm, small fleshy lobe hung over mouth is known as

Options

A. Peristomium
B. Nephridiopores
C. Clitellum
D. Prostomium

Explanation

To answer the question regarding the small fleshy lobe that hangs over the mouth of an earthworm, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structures of the Earthworm**:
- Understand the anatomy of the earthworm, which includes various segments and structures.

2. **Evaluate the Options**:
- The options given are:
- a) Peristomium
- b) Nephridiopore
- c) Clitellum
- d) Prostomium

3. **Analyze Each Option**:
- **Peristomium**: This is the first true segment of the earthworm's body that surrounds the mouth.
- **Nephridiopore**: This is an opening related to the excretory system and does not pertain to the mouth area.
- **Clitellum**: This is a glandular structure found in mature earthworms, involved in reproduction, and is not related to the mouth.
- **Prostomium**: This is a fleshy lobe located at the anterior end of the earthworm, hanging over the mouth.

4. **Determine the Correct Answer**:
- The question specifically asks for the small fleshy lobe that hangs over the mouth. Based on the analysis, the correct answer is **Prostomium**.

5. **Conclusion**:
- Therefore, the small fleshy lobe that hangs over the mouth of the earthworm is known as the **Prostomium**.