The edible seaweed used is found in industry for gelling and thickening is:

Options

A. butter
B. agar-agar
C. chocolate
D. carrageenans

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of an edible seaweed that is used in the food industry for gelling and thickening purposes.

2. **Analyzing the Options**:
- **Option A: Butter** - This is a dairy product and not a seaweed.
- **Option B: Agar Agar** - This is a substance derived from red algae and is used for gelling, but it is not the most common answer for this specific question.
- **Option C: Chocolate** - This is a confectionery product and not related to seaweed.
- **Option D: Carrageenins** - This is a family of polysaccharides extracted from red edible seaweed and is commonly used for thickening and gelling in the food industry.

3. **Identifying the Correct Answer**: Based on the analysis, the correct answer is **Option D: Carrageenins**. They are specifically known for their use in the food industry for gelling and thickening.

4. **Conclusion**: The edible seaweed used in the industry for gelling and thickening is carrageenins.

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