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: Birth control for koalas MELBOURNE, Australia - Koalas are considered in danger of extinction in parts of Australia, but in one southern state authorities plan to implant 2,000 of the furry marsupials with contraceptives to control their numbers.

Sci/Tech