Question: McDonald's was puchased by which businessman who joined the company as a franchise agent in 1955?

full_context: Document 1: Fatburger: Fatburger Inc. is an American fast casual restaurant chain. Its tagline is "The Last Great Hamburger Stand". While it is a fast food restaurant, the food is cooked and made to order. Some Fatburger restaurants have a liquor license, as well as Fat Bars. Its franchise headquarters are in Beverly Hills, California. In addition to the United States, the chain operates in 19 other countries.
Document 2: 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 3: 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 4: McDonald's Canada: McDonald's Canada (French: "Les Restaurants McDonald du Canada Ltée" ) is the Canadian master franchise of the fast-food restaurant chain McDonald's, owned by the American parent McDonald's Corporation. One of Canada's largest fast-food restaurant chains, the franchise sells food items, including hamburgers, chicken, French fries and soft drinks all across the country. McDonald's is known for its high fat and calorie foods, but it also has alternatives such as salads, juices and milk. McDonald's was previously Canada's largest food service operator before being overtaken by Tim Hortons in 2005. The slogans used in Canada are "i'm lovin' it" (in English) and "c'est ça que j'm" (in French).
Document 5: Dave Thomas (businessman): Rex David "Dave" Thomas (July 2, 1932January 8, 2002) was an American businessman and philanthropist. Thomas was the founder and chief executive officer of Wendy's, a fast-food restaurant chain specializing in hamburgers. He is also known for appearing in more than 800 commercial advertisements for the chain from 1989 to 2002, more than any other company founder in television history.
Document 6: Bob Wian: Robert C. "Bob" Wian (June 15, 1914 – March 31, 1992) was the founder of the Big Boy restaurant chain. The restaurant got its start in a 10-stool Glendale, California, hamburger stand in 1936 with an investment of $350 which Wian got from the sale of a used car. He sold the Big Boy chain to the Marriott Corp. in 1967 for $7,000,000. Wian died in Newport Beach, California, and was survived by his wife, June, and two sons, Chapman Baehler and Casey Wian, two daughters, Barbara Baehler and Julie Wian, and sisters Doris Weis and Katherine Kurvink.
Document 7: S. Truett Cathy: Samuel Truett Cathy (March 14, 1921 – September 8, 2014) was an American businessman, investor, author, and philanthropist. He founded the fast food restaurant chain Chick-fil-A.
Document 8: Joan Kroc: Joan Beverly Kroc (née Mansfield, previously Smith; August 27, 1928 – October 12, 2003), also known as Joni, was the third wife of McDonald's CEO Ray Kroc. She was also known for her involvement in the McDonald's organization and for her philanthropy.
Document 9: El Camino Memorial Park: El Camino Memorial Park cemetery is located at 5600 Carroll Canyon Road in the Sorrento Valley neighborhood of San Diego. Founded in 1960, El Camino is a 220 acre memorial park and is the final resting site for Jonas Salk (founder of the polio vaccine and the renowned Salk Institute), as well as several members of the well-known Kroc family (humanitarians, philanthropist, former owners of San Diego Padres baseball team, as well as Ray Kroc's position as C.E.O of McDonald's fast food chain). There are many other prominent citizens from the greater San Diego and Los Angeles area as well.
Document 10: Ray Kroc: Raymond Albert "Ray" Kroc (October 5, 1902 – January 14, 1984) was an American businessman. He joined the Californian chain McDonald's in 1954 and built it into a nationwide and eventually global franchise, making it the most successful fast food corporation in the world. Controversially, Kroc would present himself as the founder of McDonald's during his later life. Kroc was included in "", and amassed a fortune during his lifetime. He owned the San Diego Padres baseball team from 1974 until his death in 1984.
Document 11: McDonald's No. 1 Store Museum: The McDonald's #1 Store Museum is housed in a replica of the former McDonald's restaurant in Des Plaines, Illinois, opened by Ray Kroc in April 1955. The company usually refers to this as The Original McDonald's, although it is not the first McDonald's restaurant but the ninth; the first was opened by Richard and Maurice McDonald in San Bernardino, California in 1940, while the oldest McDonald's still in operation is the third one built, in Downey, California, which opened in 1953. However, the Des Plaines restaurant marked the beginning of future CEO Kroc's involvement with the firm. It opened under the aegis of his franchising company McDonald's Systems, Inc., which became McDonald's Corporation after Kroc purchased the McDonald brothers' stake in the firm.
Document 12: Burger King (Mattoon, Illinois): Burger King is a restaurant founded by the Hoots family and operated by Burger King LLC of Illinois in Mattoon, Illinois, United States; it is not related to the fast food chain Burger King. The restaurant's founders claim it is the "original" Burger King and predates the fast food chain. A 1968 court case between this restaurant and the larger Burger King chain is a well-known case in United States trademark law regarding the Lanham Act.
Document 13: The Founder: The Founder is a 2016 American biographical drama film directed by John Lee Hancock and written by Robert Siegel. The film stars Michael Keaton as businessman Ray Kroc, and portrays the story of his creation of the McDonald's fast food chain. Nick Offerman and John Carroll Lynch co-star as McDonald's founders Richard and Maurice McDonald.
Document 14: McDonald's: McDonald's is an American hamburger and fast food restaurant chain. It was founded in 1940 as a barbecue restaurant operated by Richard and Maurice McDonald, in San Bernardino, California. In 1948, they reorganized their business as a hamburger stand, using production line principles. The first McDonald's franchise using the arches logo opened in Phoenix, Arizona in 1953. Businessman Ray Kroc joined the company as a franchise agent in 1955 and subsequently purchased the chain from the McDonald brothers. Based in Oak Brook, Illinois, McDonald's confirmed plans to move its global headquarters to Chicago by early 2018.
Document 15: McDonald's Israel: McDonald's Israel (Hebrew: מקדונלד'ס ישראל‎ , "Maqdonald's Yisra'el " ‎ ) is the Israeli master franchise of the fast food restaurant chain McDonald's. Operated and licensed by Alonyal Limited (Hebrew: אלוניאל בע"מ‎ ‎ , "Alonyal Ba'am"), McDonald's Israel is the largest of Israel's burger chains with a 60% market share. The company sells hamburgers, chicken nuggets, French fries and soft drinks in branches across the country. Since its opening in Israel in 1993, McDonald's Israel has been in competition with Burger Ranch, Israel's second largest burger chain. The world's first kosher McDonald's opened in Mevaseret Zion in October 1995.
ground_truth: Raymond Albert "Ray" Kroc