## 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 include:
- Health education on prevailing health problems and methods of preventing and controlling them
- Nutrition
- 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:** Health education is a component of PHC, as it empowers individuals and communities to make healthy choices.
- **Option B:** Nutrition advice and ensuring access to nutritious food is also a part of PHC, aiming to prevent malnutrition and related health issues.
- **Option C:** Provision of essential drugs is a critical component, ensuring that individuals have access to necessary medications for common diseases.

## Why Option D is Correct (Not a component of PHC)
- **Option D:** While options A, B, and C represent actual components of PHC, without the specific details of option D, we infer based on common PHC components. Typically, specialized surgical services are not considered a component of primary health care but rather of secondary or tertiary care.

## Clinical Pearl / High-Yield Fact
A key aspect of primary health care is its focus on accessibility, affordability, and community participation. A memorable point is that PHC acts as the first level of contact of individuals, families, and communities with the national health system, bringing health care as close as possible to where people live and work.

## Correct Answer: D.