What type of yarn is known for its exceptional softness and is made from a specific kind of wool?

The choice of cashmere as the correct answer is grounded in its unique qualities that set it apart from other types of yarn. Cashmere is derived from the fine undercoat of cashmere goats, which are primarily found in regions with harsh winters, such as Mongolia and portions of China. This type of wool is highly prized for its exceptional softness and warmth. The fibers are finer and lighter compared to other wool types, making garments made with cashmere incredibly soft against the skin while maintaining excellent insulation properties.

In contrast, while alpaca, merino, and angora are also known for their unique qualities and can be soft, they do not match the distinctive softness achieved by cashmere. Alpaca fibers tend to be a bit coarser and heavier, making them less soft than cashmere. Merino wool, while often soft, mainly differs in terms of durability and stretchiness, being more suitable for activewear. Angora, while soft and fluffy, is derived from rabbit fur and can sometimes be more prone to shedding. Therefore, cashmere stands out clearly as the yarn associated with exceptional softness, making it the correct answer in this context.