First case that comes to notice of physician is ?
**Core Concept**
The question is testing the understanding of the term "first case" in the context of epidemiology, specifically in the context of infectious diseases. The correct answer refers to the first individual or case that comes to the attention of a physician or healthcare worker, often marking the beginning of an outbreak or epidemic.
**Why the Correct Answer is Right**
The correct answer is the "index case." The index case is the first individual to come to medical attention, often with symptoms or signs that lead to the discovery of an outbreak. This individual may not necessarily be the source of the infection, but rather the first case to be diagnosed. The index case can serve as a sentinel case, prompting further investigation and public health action to control the spread of the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because it does not accurately describe the term "first case" in the context of epidemiology.
**Option B:** This option may be a distractor, but it does not specifically describe the index case, which is the first case to come to medical attention.
**Option C:** This option may be a distractor, but it does not accurately describe the term "first case" in the context of epidemiology.
**Clinical Pearl / High-Yield Fact**
A key takeaway is that the index case is often the starting point for outbreak investigation and control efforts. Identifying the index case can help public health officials track the source of the outbreak, identify high-risk populations, and implement targeted interventions to control the spread of the disease.
**Correct Answer:** A. Index case.