Which is the fiber produced from the undercoat of a goat's pet?

The fiber produced from the undercoat of a goat's pet is known as cashmere. This luxurious fiber comes specifically from cashmere goats, which have a fine, soft undercoat that provides warmth in their natural habitats. Cashmere is highly prized for its softness, insulation properties, and lightweight characteristics, making it a popular choice in high-end textiles.

Other options like mohair, angora, and silk originate from different animals or processes. Mohair, for instance, is produced from the hair of Angora goats, while angora fiber comes from Angora rabbits, and silk is secreted by silkworms. Each of these fibers has distinct characteristics and uses but does not come from the undercoat of a goat's pet.