Explanation:

- Terylene:

- Terylene is NOT a natural fiber.

- It is a synthetic polyester fiber.

- Commonly used in textiles for clothing and other products.

- Wool:

- Wool is a natural fiber.

- Obtained from the fleece of sheep and other animals.

- Known for its warmth and elasticity.

- Flax:

- Flax is a natural fiber.

- Extracted from the flax plant.

- Used to make linen textiles.

- Jute:

- Jute is a natural fiber.

- Derived from the jute plant.

- Often used for making burlap and hessian fabrics.

Terylene is the correct answer.