Question: What restaurant chain with over 15,000 locations is a sister franchise to Wing Street?

Context paragraphs:
Capriotti's: Capriotti's is a Las Vegas-based fast casual restaurant chain located in the United States.  The restaurant chain was founded in Wilmington, Delaware in 1976.  Capriotti's has 106 company-owned and franchise locations in 16 states, including the District of Columbia.

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.

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.

Mugg &amp; Bean: Mugg & Bean is a full-service, & On-The-Move restaurant, coffee-themed franchise restaurant chain originating from South Africa.  The restaurant chain was founded in 1996 by Ben Filmalter after a visit to a Chicago coffee shop in the early 1990s inspired him to open a similar restaurant in South Africa.  The franchise was bought by Famous Brands in 2009.

VIP's: VIP's, alternatively written Vip's, is a defunct restaurant chain in the Western United States that operated from 1968 until the late 1980s, based in Salem, Oregon.  With more than 50 locations, it was once the largest restaurant chain based in Oregon.  It was a Denny's-style restaurant, a type that was commonly known at that time as a "coffee shop" but is now more commonly known as a casual dining restaurant.  Most restaurants were located near freeways and were open 24 hours.  At its peak, the chain had locations in five states: Oregon, Washington, Idaho, Nevada and northern California.

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.

Chicken in the Rough: Chicken in the Rough, also known as Beverly's Chicken in the Rough, is a fried chicken restaurant chain and former franchise.  It was one of the earliest restaurant chain franchises in the United States.  Chicken in the Rough was founded by Beverly and Rubye Osborne in 1936 in Oklahoma City, and the restaurant's specialty half-fried chicken dish was also created in 1936.  The dish itself was also referred to as "Chicken in the Rough", and consisted of a half fried chicken, shoestring potatoes and a biscuit with honey.  Three restaurants presently serve the dish today, located in Port Huron, Michigan and Canadian neighbor Sarnia, Ontario.  The chain's logo was an image of a rooster smoking a cigar and carrying a golf club.  The chain also used a logo of "Chicken's Caddie", which depicted a chick acting as a golf caddie, stating "I'll gladly be fried for Chicken in the Rough".

Chefette: Chefette Restaurants is the largest fast food restaurant chain based in the Caribbean island nation of Barbados.  Currently operating throughout the island in 14 locations, Chefette is known for its broasted chicken meals as well as a local curried-'meat + vegetable' (similar to the European Gyro) roll-up or wrap, locally known as a roti.  Chefette was founded by a Trinidadian businessman named Assad John Haloute, who migrated to Barbados in 1971.  In 1972, he opened the first Chefette Restaurant at Fontabelle, St. Michael.  As the success of the chain grew over the next three decades, the restaurant chain continued its expansion.  The company's trademark colours are yellow and purple.

Wing Zone: Wing Zone is an Atlanta-based American restaurant chain that specializes in deep-fried food products; especially buffalo wings.  There are roughly 100 Wing Zone locations in 25 American states, usually in urban areas.  Wing Zone has been featured on The Food Network's "Roker on the Road", "Entrepreneur Magazine" and others.  Wing Zone has also won many awards, such as "National Festival Favorite" at the 2004 National Buffalo Wing Festival.  Wing Zone offers both take-out and delivery.

Harvey's: Harvey's is a fast food restaurant chain that operates in Canada, with locations in every province.  It serves hamburgers, hot dogs, french fries, onion rings, and other traditional fast food fare.  The chain is owned by Cara Operations.  Harvey's is the second-largest Canadian-established restaurant chain in the country behind Tim Hortons, and is the fourth-largest burger chain in Canada.

Supporting paragraphs: WingStreet Pizza Hut
Answer: Pizza Hut