1. Which of the following is an example of a natural therapeutic agent used in medicine? A. Acetaminophen B. Aspirin C. Digoxin D. Echinacea Answer: D. Echinacea Rationale: Echinacea is a natural therapeutic agent commonly used for its immunostimulant properties. 2. Synthetic therapeutic agents are: A. Derived from plants B. Produced in a laboratory C. Found in nature D. Created by animals Answer: B. Produced in a laboratory Rationale: Synthetic therapeutic agents are manufactured in a laboratory setting. 3. Which of the following is a common side effect of nonsteroidal