**Core Concept:** Primary Health Care (PHC) is a crucial component of public health systems, aiming to provide comprehensive, accessible, and community-based healthcare services for the promotion of health and prevention, diagnosis, and treatment of diseases at the earliest stage.

**Why the Correct Answer is Right:** Option C, "Community Health Workers (CHWs)", is the correct answer as they play a pivotal role in PHC delivery. CHWs are trained individuals from the community they serve, who provide basic healthcare services, health education, and promote disease prevention and control at the grassroots level. This ensures early detection and management of health problems, enhancing overall public health outcomes.

**Why Each Wrong Option is Incorrect:**

A. **Disease Control and Prevention (DCP)** focuses on controlling and preventing specific diseases, rather than providing comprehensive primary health care. While DCP is an essential component of public health, it does not encompass the broader scope of PHC.

B. **Health Education and Health Promotion (HEP)** is an important aspect of PHC, focusing on increasing health awareness and promoting healthy behaviors. However, it is not the primary role of CHWs, who primarily focus on disease prevention and management.

D. **Public Health Service (PHS)** refers to the overall organization and management of health services at various levels, including PHC. While PHS is crucial for the functioning of PHC, it does not represent a distinct entity involved in PHC delivery.

**Clinical Pearl:** Primary Health Care is a cornerstone of public health systems worldwide, ensuring the delivery of accessible, affordable, and community-based healthcare services. By involving trained Community Health Workers (CHWs), PHC aims to improve health outcomes, reduce health disparities, and empower communities to take charge of their health.