Question: Which was founded first Pizza Hut or Regina Pizzeria ?

full_context: Document 1: Frank Pepe Pizzeria Napoletana: Frank Pepe Pizzeria Napoletana, known locally as Pepe's, is a popular pizza restaurant in the Wooster Square neighborhood of New Haven, Connecticut, at 163 Wooster Street. Opened in 1925, it is one of the oldest and best known pizzerias in the United States.
Document 2: Aurelio's Pizza: Aurelio's Pizza is an Illinois restaurant chain which centers its business around the thin crust variety of Chicago-style pizza. Aurelio's Pizza has three corporate owned stores and 37 franchised locations in 6 states. Aurelio's Pizza is the oldest Chicago pizza franchise restaurant, franchising since 1974.
Document 3: Little Caesars: Little Caesar Enterprises Inc. (doing business as Little Caesars) is the third-largest pizza chain in the United States, behind Pizza Hut and Domino's Pizza. It operates and franchises pizza restaurants in the United States and internationally in Asia, the Middle East, Australia, Canada, Latin America and the Caribbean. The company was founded in 1959 and is based in Detroit, Michigan, headquartered in the Fox Theatre building in Downtown. Little Caesar Enterprises, Inc. operates as a subsidiary of Ilitch Holdings, Inc.
Document 4: Hungry Howie's Pizza: Hungry Howie's Pizza & Subs, Inc., also known as Hungry Howie's Pizza, is a franchise and the 11th largest pizza chain in the United States, with over 550 locations. Hungry Howie's products include pizza, calzone-style subs, chicken wings and tenders, bread, salads, and brownies. Its headquarters are located in Madison Heights, Michigan in Metro Detroit.
Document 5: Papa's Tomato Pies: Papa's Tomato Pies is a historic pizzeria selling tomato pies in New Jersey. It was founded by Giuseppe "Joe" Papa in 1912 on South Clinton Avenue in Trenton, New Jersey. Papa's is the oldest family owned and longest continuously operating pizzeria in the United States. Papa's is the second oldest pizzeria in the United States after Lombardi's Pizza, however Lombardi's closed for a decade from 1984 to 1994 and was reopened under new management.
Document 6: Lombardi's Pizza: Lombardi's is a pizzeria located at 32 Spring Street on the corner of Mott Street in the Nolita neighborhood in the borough of Manhattan, New York City. Opened in 1905, it has been acknowledged by the Pizza Hall of Fame as the first pizzeria in the United States.
Document 7: Regina Pizzeria: Regina Pizzeria, also known as Pizzeria Regina, and originally called Regina Pizza, is a regional pizza chain in New England. The company was founded in 1926 by Luigi D'Auria in Boston's North End neighborhood. It has been run by the Polcari family since 1956. The chain is a part of Boston Restaurant Associates and is headquartered in Lynnfield, Massachusetts.
Document 8: 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 9: Russo's New York Pizzeria: Russo’s New York Pizzeria is based in Houston, Texas and was established in 1992 by Anthony Russo. The chain serves New York-style pizza as well as several different types of soups, salads, pastas, calzones and dessert. They are famous for their "party pizzas," which are 2 ft in diameter.
Document 10: Bertucci's: Bertucci's is a Northborough, Massachusetts-based private company which runs a chain of sit-down Italian restaurants offering brick oven pizza and Italian food. It also offers delivery (from some stores), take-out and private dining. Bertucci's was founded by Joey Crugnale in Davis Square, Somerville, Massachusetts, in 1981. The company expanded rapidly during the 1990s. Bertucci's locations are primarily found in the Northeast, but range as far south as Virginia. N.E. Restaurant Co. Inc. bought out Bertucci's in 1998, adopting the Bertucci's Co. name in 2001.
Document 11: Pie Five: Pie Five Pizza Co. is a fast casual restaurant chain specializing in handcrafted personal pizza made in less than 5 minutes. The brand is owned by Rave Restaurant Group, which also owns Pizza Inn. As of December 2016, Pie Five has 98 restaurants in the following locations: Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Kansas, Maryland, Minnesota, Missouri, Nebraska, North Carolina, Oklahoma, Tennessee, Texas, Utah, Kentucky, Virginia and Washington, D.C. with more than 400 additional company-owned and franchise units anticipated.
Document 12: 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 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: Gennaro Lombardi: Gennaro Lombardi was an Italian immigrant who moved to the United States in 1897, and known for opening the first pizzeria in the United States, Lombardi's. He opened a small grocery store in New York City's Little Italy. An employee of his, Antonio Totonno Pero, also an Italian immigrant, began making pizza for the store to sell. Their pizza became so popular that Lombardi opened the first US pizzeria in 1905, naming it simply Lombardi's.
Document 15: Pizza Hut Israel: Pizza Hut Israel (Hebrew: פיצה האט‎ ‎ ) is the Israeli franchise of Pizza Hut with 56 branches as of September 2014. Pizza Hut Israel is the largest pizza chain in Israel.
ground_truth: Regina Pizzeria