Explanation:

Introduction:
Fibers are materials that are used to make fabrics and textiles. They can be classified into two main types: natural fibers and synthetic fibers. Natural fibers are obtained from plants and animals, while synthetic fibers are man-made.

Explanation of options:
a) Leather: Leather is a material made from the skin of animals, usually obtained from cattle. It is not considered a fiber because it is not used to make fabrics or textiles directly.

b) Wool: Wool is a natural fiber obtained from the fleece of sheep or certain other animals. It is commonly used to make warm and comfortable clothing items such as sweaters and blankets.

c) Silk cotton: Silk cotton, also known as kapok, is a natural fiber obtained from the seed pods of the silk-cotton tree. It is used as a filling material in pillows and cushions but is not commonly used to make fabrics or textiles.

d) Silk: Silk is a natural fiber obtained from the cocoons of silk worms. It is known for its smooth and lustrous texture and is commonly used to make luxurious fabrics such as silk sarees and silk scarves.

Conclusion:
From the given options, silk cotton is the fiber that is not obtained from animals. Leather is made from animal skin, wool is obtained from the fleece of animals, and silk is obtained from silk worms. Silk cotton, on the other hand, is obtained from the seed pods of a tree.

Silk is obtained from silk worm and silk is not obtained from silk worm or any other animal