Which of the following is NOT a main organ of the UN?

The correct answer is the World Health Organization, as it is not a main organ of the United Nations. The UN is structured with six principal organs established by the UN Charter, which includes the Security Council, General Assembly, Economic and Social Council, International Court of Justice, Secretariat, and the Trusteeship Council. Each of these plays a unique role in the functioning of the UN.

In contrast, the World Health Organization operates as a specialized agency of the UN focused specifically on global health issues. While it collaborates closely with the UN and contributes significantly to its objectives, it does not hold the same status as the main organs outlined in the UN Charter. This distinction highlights the structural hierarchy and the specific roles various entities serve in the wider context of international governance.