The correct answer is Merino. As compared to human hair which is 50 to 70 microns in diameter, Merino breed wool is lesser than 24 microns in diameter which makes it as finest wool in the world. Merino Sheep having Spain as a native is considered as an exotic breed and adapts semiarid climates. They have a large number of skin folds. Australian Merino sheep wool is the worlds finest and softest wool. Merino SheepAdditional Information 1. Lincoln SheepNative - England They are also called Lincoln Longwool. They produce the heaviest, longest, and most lustrous fleece in the world. Lincoln Sheep2. Corriedale SheepNative - New ZealandA crossbreed of Merino and Lincoln. They are hornless (polled) and dual-purpose breed (wool and meat). Corriedale Sheep3. Rambouillet SheepNative - FranceThey are also called Rambouillet Merino or French Merino. They are dual-purpose breeds (wool and meat). Rambouillet Sheep