The public health nurse identifies that childhood obesity is a significant problem at the local elementary school. This is an example of which public health core function?

Choice A reason: Limiting partners reduces risk but doesn’t address recent exposure timing. Retesting is critical, per nursing standards. This choice errors in urgency. It’s universally distinct, less immediate.

Choice B reason: False negatives are possible but less urgent than retesting timing. Recent exposure needs emphasis, per standards. This errors in priority. It’s universally distinct, vague.

Choice C reason: HIV tests miss recent infections; retesting in 3 months ensures accuracy. This aligns with nursing standards precisely. It’s universally applied, distinctly the most immediate need.

Choice D reason: Abstinence prevents future risk but doesn’t address past exposure. Retesting fits recent acts, per nursing. This errors in relevance. It’s universally distinct, forward-looking.

Choice A reason: Environment is setting; bacteria are the agent causing infection. This errors per epidemiology standards. It’s universally distinct, not causative.

Choice B reason: Agent and host combine; bacteria alone are agent. This misaligns with triangle definitions. It’s universally distinct, overly broad.

Choice C reason: Host is the infected person, not bacteria. Agent fits, per nursing. This errors in role. It’s universally distinct.

Choice D reason: Agent is the bacteria causing vaginal infection, per epidemiology. This aligns with nursing standards. It’s universally applied, distinctly accurate.