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: Mob sets train ablaze in Bangladesh protests DHAKA, BANGLADESH -- An angry mob set fire to a passenger train and protesters clashed with police across Bangladesh yesterday, leaving dozens of people injured, as violence spread a day after a grenade attack on an opposition rally killed 19 people and 

World