Final answer:
Alcohol-resistant foams are Class B foams made with a mixture of fluorosurfactants, used to spread across surfaces and extinguish large-scale fires of organic liquids.
Step-by-step explanation:
Class B foams that are made from a mixture of fluorosurfactants are known as Alcohol-resistant foams. These fluorosurfactants reduce the surface tension of water to a level below that of the burning fuel, allowing the fluorinated solution to spread across the surface and extinguish the fire. These foams are widely utilized in scenarios that involve large-scale fires of organic liquids.