In the following question, select the odd word from the given alternatives.

In a classification-based reasoning item, three of the four given items share one defining category while the odd one belongs to a different category altogether; the task is to find the shared attribute of the majority and then identify the item that lacks it.

Here, three of the four organisations are official constituents of the United Nations system, while one operates independently of it.

• International Court of Justice: the principal judicial organ of the United Nations, established under the UN Charter.

• Security Council: one of the six principal organs of the United Nations, responsible for international peace and security.

• UNESCO: a specialized agency of the United Nations focused on education, science, and culture.

• Amnesty International: an independent, member-funded non-governmental human rights organisation with no institutional affiliation to the United Nations.

Since the International Court of Justice, the Security Council, and UNESCO are all official United Nations bodies while Amnesty International is not, Amnesty International is the odd one out.