Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) Scotland will likely seek independence for a second time this decade after the historic vote for the United Kingdom to leave the European Union, Scottish First Minister Nicola Sturgeon said Friday. Sturgeon's Scottish National Party was elected on a platform that vowed, in part, to revisit the independence issue -- last decided in a failed 2014 referendum -- should the country be "taken out of the EU against our will," Sturgeon said. "Scotland does now face that prospect," Sturgeon said. "It is a significant and material change in circumstances, and it is therefore a statement of the obvious that the option of a second referendum must be on the table, and it is on the table."Scottish First Minister Nicola Sturgeon's party has vowed to revisit independence issueIndependence rejected in 2014, but with UK vote on EU, things have changed, she says 
 Question:Scotland is one of four countries that make up the _.
Output:
United Kingdom