Which of the following is an example of epidemiological study?

An epidemiological study focuses on the patterns, causes, and effects of health and disease conditions in specific populations. By conducting a survey on health habits, researchers gather data that can reveal trends in health behavior, risk factors, or the prevalence of certain conditions among different groups. This approach utilizes systematic data collection and analysis to understand population health, which is a fundamental aspect of epidemiology.

In contrast, performing surgery on a patient and writing a prescription for antibiotics pertain to clinical practices aimed at treating individual patients rather than studying health trends in populations. Avoiding contact with sick individuals is a preventative action but does not involve data collection or analysis and does not contribute to understanding population health dynamics. Therefore, conducting a survey on health habits is the best representation of an epidemiological study.