Which of the following substances is not synthetic ?
1) Fibroin
2) Lexan
3) Neoprene
4) Teflon
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The correct answer is Fibroin .
Fibroin is an insoluble protein present in silk produced by numerous insects, such as the larvae of Bombyx mori, and other moth genera such as Antheraea, Cricula, Samia and Gonometa.