The correct answer is "mold".
Depending on the type of cheese, each would contain, respectively, one of the following two types of molds: <em> Penicillium roqueforti, </em>typically found in blue cheeses<em> </em>(such as: Stilton, Roquefort, and Gorgonzola) and <em>Penicillium camemberti,</em> present in the surface of mold-ripened cheeses (for example, Camembert and Brie).