Correct Answer: Sponge

Solution : The correct option is Sponge.

One kind of colloid that is an example of foam is a sponge. Foam refers to the dispersion of gas bubbles in a liquid or solid medium, while colloids are materials that have uniformly distributed particles within them. Their colloidal nature allows them to hold and release large amounts of liquid. A sponge is an example of a foam in a colloidal system because it forms a structure resembling foam inside its pores as it absorbs water.