Final answer:
The most common way to get a banned substance is through black market purchases. These substances include prescription or over-the-counter medicines taken in high doses, overdoses of illegal drugs, and the misuse of anabolic steroids. Using banned substances in sports is considered unethical and carries health risks.
Step-by-step explanation:
The most common way to get a banned substance is through d) Black market purchases. The black market refers to the illegal buying and selling of goods, including drugs and substances that are banned for nonmedical purposes. This can include illegal drugs like cocaine or marijuana, as well as performance-enhancing substances like anabolic steroids.
Examples of banned substances include prescription or over-the-counter medicines taken in doses that are too high or overdoses of illegal drugs. Misusing anabolic steroids is another example, where people take them in higher doses than prescribed for medical conditions.
The use of banned substances to enhance performance in sports is considered unethical and is prohibited by most international sports organizations. It raises issues of cheating and unfair advantage. Additionally, the use of these substances carries serious health risks, with significant and nonreversible side effects.