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: South Africa Ends Phelps Medal Quest  ATHENS (Reuters) - South Africa ruined Michael Phelps's  dream of winning a record eight gold medals at the Athens  Olympics with a stunning victory in the men's 4x100 meters  freestyle final on Sunday.

Sports