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: N.Korea Silent as Japan Raises Missile Issue-Kyodo  TOKYO (Reuters) - Japan expressed "serious concern" to  North Korea on Saturday about its reported plan to test-fire a  ballistic missile but the Koreans did not respond, the head of  Japan's delegation at talks in Beijing was quoted as saying.

World