**Core Concept**
Epidemiology is the study of the distribution and determinants of health-related events, diseases, or health-related characteristics among populations. The ultimate goal of epidemiological studies is to understand the relationships between risk factors, disease patterns, and health outcomes to inform public health policy and practice.

**Why the Correct Answer is Right**
The correct answer is to identify the underlying causes of disease and to develop effective prevention and control strategies. Epidemiologists use various study designs, such as observational studies and experimental studies, to investigate the associations between risk factors and disease outcomes. By identifying the key risk factors and disease patterns, epidemiologists can provide evidence-based recommendations for disease prevention and control. This is achieved by understanding the etiology of diseases, which involves identifying the genetic, environmental, and lifestyle factors that contribute to the development of disease.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while epidemiological studies may involve the collection and analysis of data, the ultimate goal is not just to collect data, but to use that data to understand the underlying causes of disease and to inform public health policy and practice.

**Option B:** This option is incorrect because while epidemiological studies may involve the identification of risk factors, the ultimate goal is not just to identify risk factors, but to understand the relationships between those risk factors and disease outcomes.

**Option C:** This option is incorrect because while epidemiological studies may involve the development of prevention and control strategies, the ultimate goal is not just to develop strategies, but to identify the underlying causes of disease and to inform public health policy and practice.

**Clinical Pearl / High-Yield Fact**
A key principle of epidemiology is that correlation does not imply causation. Epidemiologists must carefully consider the study design, data collection methods, and analysis techniques to ensure that any observed associations between risk factors and disease outcomes are due to a causal relationship rather than other factors.

**Correct Answer: D. Identifying the underlying causes of disease and to develop effective prevention and control strategies.**