Public health aims to

• A. Funding hospital construction.
• B. Providing only individual therapy sessions.
• C. Training healthcare technicians.
• D. Protecting and improving the health of people and their communities by promoting healthy lifestyles, researching disease and injury prevention, and detecting, preventing and responding to infectious diseases.

Answer: (D)

Public health is about protecting and improving the health of people and communities, not just treating individuals. It does this by promoting healthy lifestyles, researching how diseases and injuries can be prevented, and building systems to detect, prevent, and respond to infectious diseases. This broad, population-focused approach—emphasizing prevention, health promotion, surveillance, and outbreak response—best fits the aim of public health.

The other options describe important parts of the health system, but they don’t capture the overall mission. Funding hospital construction relates to expanding clinical capacity, which is about care delivery infrastructure rather than population health. Providing only individual therapy sessions targets treatment for one person rather than communities. Training healthcare technicians is crucial for the workforce, yet it’s a component of health system operations, not the primary aim of public health.