Fog is an example of a colloidal system with liquid dispersed in gas.
A.True
B.False

Hint: A colloidal system can be understood as a mixture of two or more substances, out of which one of the substances forms the base while the other forms the mixing constituent. To explain this system in simple terms, we can use the analogy of a solution.

Complete Step-by-Step Answer:
Before we forward with the solution of the given question, let us first understand some important basic concepts.
We know that a solution is made up of two major constituents: solute and solvent. The solvent is the base of the solution in which the solute dissolves. The solvent forms the major part of the solution and acts as the parent medium of the solution.
Similarly, when forming colloidal systems, we have two major constituents. One of the constituents is known as the dispersion medium which acts as the parent medium of the colloid. The other constituent is known as the dispersion phase which acts like the minor contributor in the colloidal system. The parallel between a solution and a colloid can be drawn as: a colloid has a dispersion phase which is similar to the solvent in a solution. On the other hand, the solute in a solution is similar to the dispersion medium in a colloidal system.
When we observe fog, we can understand that it consists of water particles suspended in air. Since water is a liquid and air is a gas, fog can be considered as a colloidal system with liquid dispersed in gas.
Hence the given statement is true.
Hence, Option A is the correct option

Note: A colloidal system can be of 4 different types:
 Sol (solid dispersed in liquid), emulsion (liquid dispersed in liquid), foam (gas trapped in liquid or solid) and aerosol (liquid or solid trapped in gas)