Which characteristic is true for anti-perspirants?

Anti-perspirants are specifically formulated to reduce or prevent sweating by affecting the sweat glands. They contain active ingredients, often aluminum-based compounds, that function by temporarily blocking the sweat ducts. This action constricts the sweat pores, thereby decreasing the amount of sweat that reaches the surface of the skin.

The other characteristics listed do not accurately describe the primary function of anti-perspirants. For instance, while some products may contain natural oils for added moisture or scent, this is not a defining feature of all anti-perspirants. The notion that anti-perspirants induce sweating is incorrect, as their purpose is to minimize it. Lastly, while fragrances can be a part of some anti-perspirant formulations, they are not the primary components, since the main function is to stop sweating rather than to provide scent.