Final answer:
DAWN is a surveillance system based on monitoring drug presence in individuals at emergency departments and those examined by medical examiners, helping identify drug misuse and inform policy.
Step-by-step explanation:
The Drug Awareness Warning Network (DAWN) option that correctly describes it is: d) based on the presence of drugs in the systems of persons seeking treatment in emergency departments in hospitals, and of persons who are examined by medical examiners around the country. DAWN is a public health surveillance system that monitors drug-related visits to emergency departments and drug-related deaths investigated by medical examiners and coroners. This system helps identify the substances involved in drug misuse or abuse, thereby providing essential data for decision making and policy development to tackle the ongoing challenges of drug use.