From which of the following is silk obtained?

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(C) Silk is a natural protein fiber, some forms of which can be woven into textiles. The best-known type of silk is obtained from the cocoons of the l

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From the cocoon

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(C) Silk is a natural protein fiber, some forms of which can be woven into textiles. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm $Bombyx$ $mori$. During the pupal stage, the larva secretes a proteinaceous substance from its salivary glands, which hardens upon contact with air to form a protective covering known as the cocoon. Therefore, silk is commercially harvested from the cocoon stage.

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