Schedule One substances are characterized by which description?

• A. They are high addictive with medical value
• B. They are not addictive with medical value
• C. They have moderate addiction with medical value
• D. They are high addictive with no known medical value

Answer: (D)

Schedule I substances are defined by the highest potential for abuse and no accepted medical use in the United States, with safety not established for medical use. The description in the option—being highly addictive with no known medical value—fits that idea closely: they’re viewed as having strong abuse potential and not having medical value that would justify medical use or safety oversight. The other options would imply some medical value or lower abuse risk, which does not describe Schedule I standards. So this description best captures the concept.