Which statement best captures the core aim of epidemiology?

• A. To perform laboratory experiments to study diseases
• B. To examine the distribution and determinants of health-related states in populations
• C. To design hospital management systems
• D. To analyze health policy impacts

Answer: (B)

At its heart, epidemiology focuses on describing how health problems are distributed in populations and what factors influence that distribution. It looks at who gets a disease, how common it is, where and when it occurs, and which exposures or characteristics help explain those patterns. That population-level perspective—linking distribution with determinants—is what the best description captures.

Laboratory experiments target mechanisms in controlled settings rather than population patterns; designing hospital management systems is about health care operations; analyzing health policy impacts is about policy evaluation. While epidemiology can inform policy, its primary aim is understanding health states across populations and the factors that influence them.