What is the primary characteristic of a lotion in terms of its consistency and absorption properties?

The primary characteristic of a lotion is its formulation, which typically consists of an oil-in-water base. This composition allows lotions to be lightweight and easily absorbed by the skin. The oil-in-water emulsion means that water is the primary ingredient, which gives lotions a fluid consistency that makes them effective at spreading over the skin evenly and quickly. This property is particularly advantageous for those who prefer a product that does not leave a greasy residue, as lotions can hydrate the skin without feeling heavy.

Lotions are designed for a variety of uses, including moisturizing the skin and delivering topical medications, but their rapid absorption is a standout feature that distinguishes them from thicker formulations like creams. This characteristic makes them particularly suitable for use in environments or conditions where quick absorption and a non-greasy feel are desired.

The other options do not accurately describe a lotion's characteristics in the context provided. For instance, a thicker consistency is more characteristic of creams, which are formulated with a higher oil content. Additionally, lotions are generally not designed for oral ingestion, nor are they restricted to prescription-only availability; many lotions are available over the counter. Therefore, the correct choice highlights a fundamental aspect of lotions that underscores their utility in skincare and medicinal applications.