**Core Concept**
The Alma Ata Declaration of 1978 emphasizes the importance of Primary Health Care (PHC) in providing accessible and equitable healthcare services to all individuals. PHC focuses on preventing and treating diseases through community-oriented and comprehensive approaches.

**Why the Correct Answer is Right**
The Alma Ata Declaration does not explicitly state that provision of free medicines is a component of PHC. In fact, the Declaration emphasizes the importance of making essential drugs available and accessible at affordable prices, rather than providing them for free. This approach aims to promote health equity and ensure that healthcare services are sustainable and equitable for all populations. The Declaration also emphasizes the importance of community participation and self-reliance in health care.

**Why Each Wrong Option is Incorrect**
**Option A:** Adequate supply of safe drinking water is a crucial component of PHC, as it is essential for preventing waterborne diseases and promoting overall health and well-being.
**Option B:** Nutrition is also a key component of PHC, as it plays a critical role in maintaining health and preventing malnutrition-related diseases.
**Option D:** Basic sanitation is another essential component of PHC, as it helps to prevent the spread of diseases and promote a clean and healthy environment.

**Clinical Pearl / High-Yield Fact**
The Alma Ata Declaration emphasizes the importance of community participation and self-reliance in health care, and encourages countries to develop their own health policies and programs that are tailored to their unique needs and circumstances.

**Correct Answer Line**
✓ Correct Answer: C. Provision of free medicines