Which of the following colloidal systems has liquid as the dispersed phase and solid as the dispersion medium?

Explanation

Jelly is classified as a gel in the textbook scheme, with liquid held in a solid network. Smoke is a solid aerosol, foam rubber is a gas-in-solid foam, and paint is usually a solid-in-liquid dispersion. The question tests the phase combination, rather than the particle-size definition of a colloid.