________ drugs have high abuse potential and are not approved in the United States for medical purposes.

• A. Schedule I
• B. Schedule II
• C. Schedule III
• D. Schedule IV

Answer: (A)

The category being tested is how drugs are classified by abuse potential and medical use. Schedule I includes substances with the highest potential for abuse and, importantly, no accepted medical use in the United States (and no accepted safety for use under medical supervision). Because of that, these drugs are not approved for medical purposes in the U.S. and are tightly restricted to research settings. Examples often cited in this category include heroin, LSD, and MDMA. In contrast, Schedule II drugs have medical uses but still high abuse potential, while Schedule III and IV have accepted medical uses with progressively lower abuse potential. So the statement describes Schedule I drugs.