What type of foam is specifically designed for flammable liquid fires?

Class B foam is specifically formulated to combat flammable liquid fires. It is designed to create a blanket that smothers the flames and prevents the release of flammable vapors from the liquid surfaces. This type of foam is effective on a wide range of hydrocarbons, such as gasoline, oil, and solvents, making it essential for industrial fire situations and emergencies involving flammable liquids.

Class A foam, on the other hand, is primarily effective for ordinary combustibles like wood, paper, and textiles. Its composition helps enhance the wetting characteristics of water but does not provide the vapor suppression necessary for flammable liquids. Alcohol-resistant foam is an enhanced variation of Class B foam that is specifically developed to handle polar solvents, which have different burning behaviors compared to hydrocarbons. While useful in specific scenarios, alcohol-resistant foam is not the general type used for all flammable liquid fires. Water-based foam, while also not effective against flammable liquid incidents, does not provide the same combustion-suppressing properties as Class B foam. Therefore, Class B foam stands out as the correct answer for its unique ability to effectively mitigate flammable liquid fires.