Name one of the lambic blenders listed.

De Cam is a recognized lambic blender that plays a significant role in the production of traditional Belgian lambic beers. Lambic blending is an essential process in the creation of these unique and complex sour beers, which are fermented using wild yeasts and bacteria native to the Senne Valley in Belgium. De Cam, among others, showcases the artisan approach to blending different ages and types of lambic to achieve a balanced flavor profile that reflects the character of the region.

The other choices listed are well-known breweries but do not specifically engage in the traditional lambic blending process like De Cam does. Sam Adams and Goose Island primarily focus on more mainstream beer styles and innovative craft brews, while Dogfish Head is known for its experimental and distinctive craft beers. None of them are classified as traditional lambic blenders, which distinguishes De Cam as the correct answer in the context of this question.