Discussion
Casein is an example of :
Answer: A
Casein is an example of a regenerated protein fibre.
Regenerated fibres are made by dissolving a natural polymer and spinning it back into filaments. Casein, the main protein of milk, is dissolved and extruded to make a wool-like protein fibre, sold historically as Lanital and Aralac; other regenerated protein fibres were made from soya and groundnut protein.
It is not a synthetic polymer, which is built from small petrochemical molecules (nylon, polyester), not a mineral fibre such as asbestos or glass, and not a vegetable fibre such as cotton or jute, which is cellulose.
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