**Core Concept**
Primary Health Care (PHC) is a holistic approach to healthcare that focuses on providing accessible, comprehensive, and community-based care to individuals and communities. It aims to promote health, prevent disease, and provide essential medical services in a cost-effective manner.

**Why the Correct Answer is Right**
PHC is not solely focused on hospital-based care or specialized treatments. Instead, it emphasizes preventive care, education, and community involvement to promote overall health and well-being. PHC services include health promotion, disease prevention, treatment of minor ailments, and referral to higher-level care when necessary.

**Why Each Wrong Option is Incorrect**
**Option A:** Health promotion is indeed a key function of PHC, which focuses on educating individuals and communities about healthy behaviors and lifestyles.

**Option B:** Disease prevention is another critical function of PHC, which includes vaccination programs, screenings, and early detection of diseases.

**Option C:** Treatment of minor ailments is also an essential function of PHC, which provides accessible and cost-effective care for common health issues.

**Clinical Pearl / High-Yield Fact**
It's essential to note that PHC is not a replacement for hospital-based care but rather a complement to it, providing a continuum of care from community to tertiary level.

**Correct Answer:** C. Treatment of minor ailments is not the primary focus of PHC, which is more focused on health promotion, disease prevention, and referral to higher-level care when necessary.