Which of the following is NOT a feature of an aqueous solution?

The correct choice points to a characteristic that is not typically associated with aqueous solutions. Aqueous solutions are primarily known for their capacity to dissolve substances, allowing for the distribution of medications through the bloodstream and facilitating an enhanced rate of drug dissolution.

In a typical aqueous solution, solid substances dissolve, resulting in a homogeneous mixture rather than retaining solids. This distinctive property of aqueous solutions underscores their role in pharmacology, where medications often need to be in a dissolved form to be effectively absorbed and utilized by the body. Therefore, the retention of solids contradicts the fundamental nature of aqueous solutions and their intended application in drug delivery. Additionally, aqueous solutions are generally easy to prepare, making them a common choice in pharmaceutical formulations.