During the discharge of nematocyst, the function of lasso is to

Options

A. Press and squeeze out the thread tube
B. Tigger the stimulus
C. Prevent the detachment of nematocyst from nematoblast
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Nematocysts**: Nematocysts are specialized stinging cells found in cnidarians (such as jellyfish, corals, and sea anemones). They are responsible for capturing prey and providing defense.

2. **Identifying the Lasso**: The lasso refers to a specific type of nematocyst that is characterized by its thread-like structure. It is also known as a coloblast, which is a type of cell found in the phylum Ctenophora.

3. **Function of the Lasso**: The primary function of the lasso during the discharge of a nematocyst is to prevent the detachment of the nematocyst from the nematoblast. This means that it helps to keep the stinging cell anchored to the cell from which it discharges.

4. **Options Analysis**: In the context of the question, we analyze the provided options:
- **Press and squeeze the thread tube**: This is incorrect.
- **Trigger the stimulus**: This is also incorrect.
- **Prevent the detachment of nematocyst from the nematoblast**: This is the correct function of the lasso.

5. **Conclusion**: Therefore, the correct answer to the question is that the function of the lasso is to prevent the detachment of the nematocyst from the nematoblast.