What is Epidemiology?

• A. Branch of medicine that deals with the study of the causes, distribution, and control of disease in populations.
• B. Science of living organisms' behavior.
• C. Study of individual patient diagnosis.
• D. Science of nutrition and metabolism.

Answer: (A)

Epidemiology is a field that looks at health and disease across groups, not just individuals. It asks who gets sick, when they get sick, where they live, and why, and it uses that information to prevent and control disease in populations. The description focusing on the causes (determinants), distribution, and control of disease in populations best captures this approach. It’s different from studying how a single patient presents clinically, or from topics like animal behavior or nutrition science. In dentistry, epidemiology helps us understand patterns of caries or periodontal disease in communities and test public health measures like fluoride programs or sealants to reduce disease.