**Core Concept**
Primary health care (PHC) is a foundational concept in global health, emphasizing equitable, accessible, and community-centered care focused on prevention, health promotion, and disease management. It was formally defined as a key component of health systems in the 1978 World Health Organization (WHO) report.

**Why the Correct Answer is Right**
The concept of Primary Health Care was officially proposed in 1978 during the **Alma-Ata Declaration**, held in Alma-Ata, Kazakhstan (then part of the Soviet Union). This landmark event brought together health officials from 134 countries to endorse PHC as a universal strategy for achieving health for all. The declaration emphasized equitable access to basic health services, community participation, and integration of preventive care into primary care settings.

**Why Each Wrong Option is Incorrect**
Option B: New York – While WHO has offices in New York, no major health policy declaration on PHC was launched there in 1978.
Option C: Geneva – WHO’s headquarters is in Geneva, but the Alma-Ata Declaration was not held there.
Option D: Delhi – India hosted health events, but the 1978 PHC framework was not proposed in Delhi.

**Clinical Pearl / High-Yield Fact**
Remember: **"Alma-Ata" = "Alma-Ata Declaration" = Birthplace of Primary Health Care** – this is a must-know for exams in Social & Preventive Medicine.

✓ Correct Answer: A. Alma ata