Which body of UNO gives advisory opinion on legal matters to the bodies and special agencies of the UNO?

International Court of Justice body of UNO gives advisory opinion on legal matters to the bodies and special agencies of the UNO. The International Court of Justice (ICJ), sometimes called the World Court, is the principal judicial organ of the United Nations (UN). The ICJ settles disputes between states and gives advisory opinions on international legal issues referred to it by the UN.