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: Argentine Teen Kills Three in School Shooting  BUENOS AIRES, Argentina (Reuters) - A 15-year-old schoolboy  armed with a pistol killed three fellow Argentine students and  wounded six on Tuesday in a school shooting that shocked a  country unaccustomed to such violence.

World