Concept:
Blue cheese refers to a category of cheeses that have been ripened with specific edible molds.
• Mold: Usually from the genus Penicillium.
• Characteristic: Features distinct blue, blue-gray, or blue-green veins.
Step 1: Identifying the specific mold.
The most famous mold used is Penicillium roqueforti.
This mold produces the sharp, pungent flavor and the colorful veins.
Step 2: Historical significance.
Roquefort is one of the world's best-known blue cheeses, originating in France.
In many contexts, Roquefort is used as the standard representative for the blue cheese category.
Step 3: Analyzing other options.
Cottage cheese is a fresh, unripened curd.
Camembert is a soft-ripened cheese, but it uses white mold (P. camemberti).
Final Answer: (A)