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: 1st US-Vietnam Flight in 30yrs Symbol of Closer Ties  WASHINGTON (Reuters) - The first U.S. passenger flight to  Vietnam since 1975 shows bilateral ties are "right on track"  between old battlefield foes who still spar over human rights  and trade, a Vietnamese spokeswoman said on Thursday.

World