Which of the following is an example of mechanical exfoliation?

Mechanical exfoliation involves physically removing dead skin cells from the surface of the skin. This process typically utilizes tools or products that provide a scrubbing or abrasive effect. Granular scrubs, by their nature, contain small particles that help to slough off the dead skin layers when massaged onto the skin.

In contrast, chemical exfoliants like Jessner's peel, salicylic acid, and alpha hydroxy acids work by dissolving the bonds that hold dead skin cells together, rather than physically scrubbing them away. Thus, they fall into a different category of exfoliation techniques. Therefore, granular scrubs are an appropriate example of mechanical exfoliation, as they rely on physical action for effective skin renewal.