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B
Cellulose
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C
Protein
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D
Carbohydrate
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Solution
The correct option is C Protein
Silk fibers are composed of fibroin. It is an insoluble protein. Sericin and fibroin are two main proteins present in the raw material of protein. It has a amino acid sequence of (Gly-Ser-Gly-Ala-Gly-Ala)n. It is secreted by caterpillar larva of silkworm but is obtained from the cocoon.