Teacher: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].
Teacher: Now, understand the problem? Solve this instance: Car Bomb Kills at Least 20 at Iraq Academy KIRKUK, Iraq - A suicide attacker detonated a car bomb Saturday outside a police academy in the northern Iraqi city of Kirkuk as hundreds of trainees and civilians were leaving for the day, killing at least 20 people and wounding 36, authorities said.    Separately, U.S and Iraqi forces clashed with insurgents in another part of northern Iraq after launching an operation to destroy an alleged militant cell in the town of Tal Afar, the U.S...
Student:
World