Which body is NOT one of the primary organs of the United Nations?

The World Health Organization (WHO) is classified as a specialized agency of the United Nations rather than a primary organ. The United Nations has six primary organs established by the UN Charter: these are the General Assembly, the Security Council, the International Court of Justice, the Secretariat, the Economic and Social Council, and the Trusteeship Council. Each of these organs plays a distinct and crucial role in the functioning of the UN, focusing on different areas of international governance, peacekeeping, justice, and socio-economic development.

In contrast, while the WHO is integral to coordinating global health efforts and advancing public health initiatives, it operates as a specialized agency with a focus on health-related issues. This means it functions independently within the broader UN system, collaborating with the United Nations but not being one of its core governing bodies. This distinction is key in identifying the primary organs of the UN versus its various agencies and programs.