Final answer:
The Health perception-health management pattern from Gordon's functional pattern best addresses the concern about drug abuse and violence in a community.
Step-by-step explanation:
The best functional pattern from Gordon's functional pattern that addresses the pervasive concern about drug abuse and violence in a community is the Health perception-health management pattern. This pattern focuses on how individuals and communities perceive health and manage it. In the context of drug abuse and violence, this pattern would involve assessing the community's awareness and understanding of these issues, their attitudes towards them, and how they take actions to prevent and address them.