Question: Which country is the chain that owns WingStreet operated by a separate company?

full_context: Document 1: KFC in Japan: KFC (the name was originally an initialism for Kentucky Fried Chicken) is a fast food restaurant chain that specializes in fried chicken and is headquartered in Louisville, Kentucky, United States (US). It is the world's second largest restaurant chain (as measured by sales) after McDonald's, with 18,875 outlets in 118 countries and territories as of December 2013 . The company is a subsidiary of Yum! Brands, a restaurant company that also owns the Pizza Hut and Taco Bell chains.
Document 2: Yum China: Yum China Holdings Inc. is a Fortune 500 fast-food restaurant company incorporated in the United States and having joint headquarters in Plano, Texas and Shanghai. With $6.8 billion of revenue in 2016 and over 7,500 restaurants, it is the largest restaurant company in China. Spun off from Yum! Brands in 2016, its 420,000 employees represent the 3rd largest worldwide labor force among all U.S. companies.
Document 3: Burger Street: Burger Street is an American fast food restaurant chain specializing in hamburgers and chicken sandwiches. s of 2015 , the chain has 14 locations in the Dallas–Fort Worth metroplex and 4 locations in the greater Tulsa, Oklahoma, area.
Document 4: KFC in China: KFC is a fast food restaurant chain that specializes in fried chicken and is China's largest restaurant chain. KFC restauruants in China are owned or franchised by Yum China, a restaurant company that also owns the Pizza Hut and Taco Bell chains in China and was spun off from Yum! Brands in 2016.
Document 5: Fast food in China: Western-style fast food in China is a recent phenomenon, dating back only to January 1984 when McDonald's opened its first outlet in Taipei, Taiwan Province in the Republic of China. In October 1987, Kentucky Fried Chicken, still the most popular fast food chain in China, established its first restaurant in the People's Republic of China (mainland area), located in Beijing. KFC was later followed by McDonald's, which remains China's number two foreign fast food option. In addition to American style fast food, China has many local options, including a slew of restaurants that attempt to imitate fast food, particularly KFC.
Document 6: KFC: KFC, until 1991 known as Kentucky Fried Chicken, is an American fast food restaurant chain that specializes in fried chicken. Headquartered in Louisville, Kentucky, it is the world's second-largest restaurant chain (as measured by sales) after McDonald's, with almost 20,000 locations globally in 123 countries and territories as of December 2015 . The chain is a subsidiary of Yum! Brands, a restaurant company that also owns the Pizza Hut and Taco Bell chains.
Document 7: Wendy's International: Wendy's International, Inc. is the parent company of Wendy's Old Fashioned Hamburgers. It also owned 70 percent of Cafe Express. The Tim Hortons chain was spun off by Wendy's into a separate company in September 2006. The Baja Fresh chain was sold in October 2006. On September 15, 2008, the purchase of Wendy's International Inc. by Triarc Inc. was approved by shareholders. On September 30, the merger was completed with a name change of Wendy's/Arby's Group, Inc, a change of leadership for both Arby's and Wendy's and the stock symbol changed to WEN.
Document 8: Restaurant Brands International: Restaurant Brands International is a Canadian multinational fast food company. Formed in 2014 by the $12.5 billion merger between American fast food restaurant chain Burger King and the Canadian coffee shop and restaurant chain Tim Hortons, and expanded by the 2017 purchase of Louisiana-based and themed Popeyes Louisiana Kitchen, the company is the third-largest operator of fast food restaurants in the world. The company is based alongside Tim Hortons in Oakville, Ontario, but both chains retain their existing operations and headquarters in Oakville and Miami respectively. The merger focused primarily on expanding the international reach of the Tim Hortons brand, and providing financial efficiencies for both companies.
Document 9: Yum! Brands: Yum! Brands, Inc., or Yum! and formerly Tricon Global Restaurants, Inc., is an American fast food company. A Fortune 500 corporation, Yum! operates the brands Taco Bell, KFC, Pizza Hut, and WingStreet worldwide, except in China, where the brands are operated by a separate company, Yum China. Prior to 2011, Yum! owned Long John Silver's and A&W Restaurants.
Document 10: Focus Brands: Focus Brands is an affiliate of the Atlanta-based private equity firm, Roark Capital Group, that currently owns the Schlotzsky's, Carvel, Cinnabon, Moe's Southwest Grill, McAlister's Deli, and Auntie Anne's brands. It is based in Sandy Springs, Georgia and operates over 5,000 stores.
Document 11: WingStreet: WingStreet is a restaurant chain specializing in chicken. The restaurant chain is owned by Yum! Brands, which also owns its sister franchise Pizza Hut. As of September 2008, there were close to 1,600 locations in the U.S., Canada, and Australia. They are almost always co-located with Pizza Hut.
Document 12: Long John Silver's: Long John Silver's LLC is an American fast-food restaurant chain that specializes in seafood. The brand's name is derived from the novel "Treasure Island" by Robert Louis Stevenson, in which the pirate "Long John" Silver is one of the main characters. Formerly a division of Yum! Brands, Inc., the company was divested to a group of franchisees in September 2011.
Document 13: Pizza Hut: Pizza Hut is an American restaurant chain and international franchise founded in 1958 by Dan and Frank Carney. The company is known for its Italian-American cuisine menu including pizza and pasta, as well as side dishes and desserts. Pizza Hut has over 15,000 locations worldwide as of 2015, and is a subsidiary of Yum! Brands, Inc., one of the world's largest restaurant companies.
Document 14: Kraft Foods Inc: Kraft Foods Inc. was an American multinational confectionery, food and beverage conglomerate. It marketed many brands in more than 170 countries. 12 of its brands annually earned more than $1 billion worldwide: Cadbury, Jacobs, Kraft, LU, Maxwell House, Milka, Nabisco, Oreo, Oscar Mayer, Philadelphia, Trident, Tang. Forty of its brands are at least a century old.
Document 15: Baiada Poultry: Baiada Poultry is a privately owned Australian company which produces poultry products throughout Australia. Their operations include broiler and breeder farms, hatcheries, processing plants, feedmilling and protein recovery. Their head office is at Pendle Hill, New South Wales. Other major operating centres are located in Beresfield, Brisbane, South Australia, Tamworth and Victoria. According to the company, they employ approximately 2200 people. Baiada is one of Australia's largest poultry processing companies with a market share of more than 20%, producing the Lilydale Select and Steggles brand to retailers including Coles, Woolworths, IGA, Aldi, McDonald's, KFC, Pizza Hut, Red Rooster, Nando's and Subway.
ground_truth: China