Silk thread is obtained from silk moth during

Options

A. pupal stage
B. larval stage
C. nymph stage
D. adult stage

Explanation

**Step-by-Step Solution:**

1. **Identify the Organism**: The silk thread is obtained from the silk moth, specifically the species known as *Bombyx mori*.

2. **Understand the Life Cycle Stages**: The life cycle of the silk moth consists of several stages:
- Egg
- Silkworm (larval stage)
- Cocoon (pupal stage)
- Adult moth

3. **Focus on the Relevant Stage for Silk Production**:
- The silk thread is produced during the cocoon stage.
- After the silkworm has fed on mulberry leaves and grown for about 30 days, it spins a protective cocoon around itself.

4. **Silk Extraction Process**:
- Once the silkworm has formed its cocoon, it enters the pupal stage.
- To extract the silk, the pupae are typically killed by plunging the cocoon into boiling water, which allows the silk thread to be unwound.

5. **Conclusion**: Therefore, the silk thread is obtained from the silk moth during the pupal stage, specifically when it is in the cocoon.

**Final Answer**: Silk thread is obtained from the silk moth during the pupal stage.

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