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: Sudan rebel leader vows to respect truce A rebel leader in Sudan #39;s Darfur region has said his group will fully respect a truce with Khartoum, countering earlier statements by a spokesman declaring the agreement null and void.

World