## Core Concept
Primary health care (PHC) is an essential health care approach that is based on practical, scientifically sound, and socially acceptable methods and technology made universally accessible to individuals and families in the community through their full participation and at a cost that the community and country can afford. It includes health education on prevailing health problems and methods of preventing and controlling them, nutrition, and an adequate supply of safe water and basic sanitation.

## Why the Correct Answer is Right
The components of primary health care typically include:
- Health education on prevailing health problems and methods of preventing and controlling them
- Nutrition and an adequate supply of safe water and basic sanitation
- Maternal and child health care including family planning
- Immunization against major infectious diseases
- Appropriate treatment of common diseases and injuries
- The provision of essential drugs

## Why Each Wrong Option is Incorrect
**Option A:** Typically, health education is a component of PHC, aiming to educate individuals and communities about health promotion and disease prevention.

**Option B:** Provision of essential drugs is also a key component, ensuring that communities have access to necessary medications.

**Option C:** Maternal and child health care, including family planning, is another critical component, focusing on the health of mothers and children.

## Why Option D is Correct (Implicitly)
Since the question asks which is NOT a component of primary health care and given that options A, B, and C are recognized components, the correct answer must relate to an option that does not fit with these established elements of PHC.

## Clinical Pearl / High-Yield Fact
A key aspect of primary health care is its accessibility and affordability to all individuals in a community. It emphasizes prevention and health promotion, not just treatment of diseases.

## Correct Answer: D.