**Core Concept**
The theory of the web of causation is a concept in epidemiology that describes the complex relationships between various factors that contribute to the development and distribution of diseases. This theory emphasizes the multifactorial nature of disease causation and the interconnectedness of different risk factors.

**Why the Correct Answer is Right**
The theory of the web of causation was introduced by Austin Bradford Hill, a British statistician and epidemiologist, to provide a framework for understanding the complex relationships between risk factors and disease outcomes. According to this theory, diseases result from the interaction of multiple factors, including genetic, environmental, and behavioral influences, which are interconnected and influence one another. This theory is a fundamental concept in epidemiology and is widely used in the study of disease causation.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because the theory of the web of causation is not associated with John Snow, who is known for his work on cholera epidemiology.
**Option B:** This is incorrect because the theory of the web of causation is not related to the germ theory of disease, which emphasizes the role of microorganisms in disease causation.
**Option C:** This is incorrect because the theory of the web of causation is not attributed to Louis Pasteur, who made significant contributions to vaccination and germ theory.

**Clinical Pearl / High-Yield Fact**
The theory of the web of causation highlights the importance of considering multiple factors when investigating disease causation, rather than focusing on a single cause. This approach has significant implications for public health policy and disease prevention.

**Correct Answer: C. Austin Bradford Hill. Austin Bradford Hill introduced the theory of the web of causation in epidemiology.**