According to the material, what is the bolus?

• A. A liquid solvent
• B. A dry powder
• C. The mixture of the vehicle and drug that is administered and binds with body tissue
• D. A pill

Answer: (C)

A bolus is a single, concentrated dose delivered to produce a rapid effect, formed by the drug together with its vehicle and administered as a mass that interacts with body tissues as distribution occurs. That description—“the mixture of the vehicle and drug that is administered and binds with body tissue”—best fits what a bolus is. A liquid solvent alone isn’t the dose, a dry powder isn’t ready for administration without a vehicle, and a pill describes a solid oral form rather than a single-dose mass designed for rapid action.