An emulsion is a colloidal solution formed by mixing:
A.Two immiscible liquids.
B.Two missile liquid.
C.Any two solid
D.Any two gases.

Hint: We know that an emulsion is a mixture of two or more such liquids that are usually immiscible that owe to the liquid-liquid phase separation. Emulsions do not exhibit any static internal structure. Colloidal dispersion or colloids are the type of particles which lie between suspensions and solutions; there are particles which come under colloids.

Complete answer:
As we know that the emulsions have both the continuous and the dispersed phase that contain a boundary coming between both the phases which are called interfaces. Emulsions appear cloudy due to the presence of a number of phase interfaces that scatter the light passing through the emulsions. Emulsions appear white in colour, when the light is allowed to disperse in equal proportions. If the emulsion is diluted, then wavelengths of higher frequency and lower wavelength will be scattered and the emulsion appears in blue colour. This is also called the Tyndall effect. On the basis of the properties of the dispersed phase and the dispersion medium, emulsions can be classified. It can be classified as oil in water and water in oil. An emulsion could be a mixture of two or a lot of liquids that are normally immiscible. For instance, milk is associated with emulsion. It’s a sol of liquid fat in water. Associate emulsion is assessed into oil in water kind emulsion and water in oil kind emulsion in line with the classification of dispersed particles and distributed medium.
Therefore, the correct answer is Option A.

Note:
Remember that the Emulsions are thermodynamically unstable because there is a tendency for a liquid system to separate and reduce its interfacial area and its interfacial energy. Most emulsions have kinetic stability or they are stable over a period of time.