**Core Concept**
The question pertains to the definition of a health care worker, which is crucial in the context of infection control, occupational health, and medical ethics.

**Why the Correct Answer is Right**
A health care worker is an individual who provides direct patient care or supports patient care indirectly. They may include doctors, nurses, allied health professionals, and support staff. The correct answer is a specific category of health care workers who are at a higher risk of contracting and transmitting infections.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because this category does not necessarily involve direct patient care or a higher risk of infection transmission.
**Option B:** Incorrect because this category may not be directly involved in patient care or have a higher risk of infection transmission.
**Option C:** Incorrect because this category is not typically considered a high-risk group for infection transmission.

**Clinical Pearl / High-Yield Fact**
Health care workers, particularly those in high-risk categories, should adhere to strict infection control protocols to minimize the risk of transmitting infections to patients.

**Correct Answer:** C.