Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: UN Marks Anniversary of Bombing of Baghdad Mission The United Nations is marking the first anniversary of the bombing of UN headquarters in Baghdad that killed 22 people, including the world body #39;s top envoy to Iraq Sergio Vieira de Mello. 

World