Question: the 2018 winner of the mayoral race in the birthplace of Gregg Tafralis was whom?

full_context: Document 1: Georgios Stefanopoulos: Georgios Stefanopoulos (; born March 31, 1962 in Peristeri, Attiki) is a former boxer from Greece, who participated in two Summer Olympics for his native country in the men's heavyweight division (– 91 kg), starting in 1984 in Los Angeles, California. He twice won a medal at the European Championships in the early 1990s. Georgios also had some success in kickboxing, winning a gold medal in the Full-Contact heavyweight category at the W.A.K.O. European Championships 1986.
Document 2: Christina Olague: Olague was appointed to the post by mayor Ed Lee in the wake of her predecessor Ross Mirkarimi's election to be sheriff of San Francisco. However, she was defeated by challenger London Breed in the San Francisco Board of Supervisors elections, 2012. She was the first openly bisexual person to serve as a San Francisco Supervisor.
Document 3: Greg Best: Gregory Alan "Greg" Best (born July 23, 1964 in Lynchburg, Virginia) is an equestrian competitor and coach in the sport of show jumping who won two silver medals for the United States in the 1988 Summer Olympic Games in Seoul, South Korea riding the famous Gem Twist. In 1992, Best suffered a fall that shattered his shoulder. After this, he moved to New Zealand, where he rode for the New Zealand League, winning the World Cup Series. He has also served as a New Zealand National Show Jumping Selector, a National Show Jumping Coach and a member of the New Zealand Show Jumping High Performance Committee. Best coached New Zealand's jumpers for the 2004 Summer Olympic Games in Athens. Between 1987 and 2003, Best also garnered 6 FEI World Cup wins. He now conducts coaching clinics in the United States, Canada and New Zealand. Along with Gem Twist, horses named Santos and Entrepreneur have been among his champion mounts.
Document 4: 2017 Minneapolis mayoral election: No candidate achieved a majority in the first round of ballot counting on election night. Jacob Frey was declared the winner the next day after several rounds of vote tabulations.
Document 5: Georgios Tsakanikas: Tsakanikas won a gold medal in the 1959 Mediterranean Games and a bronze medal in the 1959 Summer Universiade in shot out, he also represented Greece in the 1956, 1960 and 1964 Summer Olympic Games in shot put and in 1964 in discus throw. Tsakanikas also competed tor Greece in the Balkan Games winning four silver medals in shot put in 1955, 1957, 1959, 1960, 1961. The Balkan Games have now become a loose collection of Balkan Championships. Tsakanikas personal best in shot put is 18, 21 m. achieved on 26 December 1964 in Athens. He died in Athens, March 1, 2016.
Document 6: Stephanie Brown Trafton: Stephanie Brown Trafton (born December 1, 1979) is an American track and field athlete who won the discus throwing gold medal at the 2008 Summer Olympics in Beijing. She is thus one of only two American women to have ever won the event, and the only one since the Great Depression.
Document 7: 2018 San Francisco mayoral special election: Eight candidates qualified to appear on the ballot, and a ninth qualified as a write - in. The four major candidates were former Supervisor Angela Alioto, former Acting Mayor London Breed, Supervisor Jane Kim and former State Senator Mark Leno. All four main candidates identify as Democrats, though the position is officially nonpartisan per the Constitution of California. Leno conceded the race to Breed on June 13.
Document 8: San Diego: The members of the city council are each elected from single member districts within the city. The mayor and city attorney are elected directly by the voters of the entire city. The mayor, city attorney, and council members are elected to four-year terms, with a two-term limit. Elections are held on a non-partisan basis per California state law; nevertheless, most officeholders do identify themselves as either Democrats or Republicans. In 2007, registered Democrats outnumbered Republicans by about 7 to 6 in the city, and Democrats currently (as of 2015[update]) hold a 5-4 majority in the city council. The current mayor, Kevin Faulconer, is a Republican.
Document 9: Gregg Tafralis: Gregg Tafralis ("Gregory Louis Tafralis;" born April 9, 1958 in San Francisco, California) is a former track and field athlete from the United States, who set the best world year performance in the men's shot put event in 1992. He competed for his native country at the 1988 Summer Olympics, finishing in ninth place.
Document 10: 2018 Kansas gubernatorial election: On August 7, 2018, Kobach appeared headed for victory over incumbent Governor Jeff Colyer in the Republican gubernatorial primary by an initial margin of 191 votes. By August 9, 2018, his lead stood at 121 votes, but discrepancies in some counties needed resolution, and provisional and absentee ballots may not have been counted in some counties. Democratic Senator Laura Kelly easily won the Democratic nomination. Independent Greg Orman, who finished second in the 2014 U.S. Senate race against incumbent Republican Pat Roberts, is running for governor, again as an independent candidate.
Document 11: Seattle: Seattle's political culture is very liberal and progressive for the United States, with over 80% of the population voting for the Democratic Party. All precincts in Seattle voted for Democratic Party candidate Barack Obama in the 2012 presidential election. In partisan elections for the Washington State Legislature and United States Congress, nearly all elections are won by Democrats. Seattle is considered the first major American city to elect a female mayor, Bertha Knight Landes. It has also elected an openly gay mayor, Ed Murray, and a socialist councillor, Kshama Sawant. For the first time in United States history, an openly gay black woman was elected to public office when Sherry Harris was elected as a Seattle city councillor in 1991. The majority of the current city council is female, while white men comprise a minority.
Document 12: Namibia: Inline hockey was first played in 1995 and has also become more and more popular in the last years. The Women's inline hockey National Team participated in the 2008 FIRS World Championships. Namibia is the home for one of the toughest footraces in the world, the Namibian ultra marathon. The most famous athlete from Namibia is Frankie Fredericks, sprinter (100 and 200 m). He won four Olympic silver medals (1992, 1996) and also has medals from several World Athletics Championships. He is also known for humanitarian activities in Namibia and beyond.
Document 13: George Tucker (luger): He represented Puerto Rico in the luge event at the 1984 Winter Olympics in Sarajevo, and was the only Puerto Rican representative at the Games. He was also the country's flagbearer. Tucker was, at the time, a doctoral student at Wesleyan University in the United States. He was later described by "Sports Illustrated" as "overweight but quick-witted" and as "the press's favorite loser". He finished last in his event, and reportedly "got a lot more press in the States than Paul Hildgartner, the Italian who won the gold medal". He described himself as "the luger who dripped blood", and "Time" reported that he "shed alarming amounts of skin bouncing off the wall".
Document 14: Greg Bell (athlete): Greg Bell (born November 7, 1930 in Terre Haute, Indiana) is a former track and field athlete who won the Gold Medal in the Long Jump at the 1956 Summer Olympics in Melbourne, Australia.
Document 15: Seattle: Like most parts of the United States, government and laws are also run by a series of ballot initiatives (allowing citizens to pass or reject laws), referenda (allowing citizens to approve or reject legislation already passed), and propositions (allowing specific government agencies to propose new laws/tax increases directly to the people). Federally, Seattle is part of Washington's 7th congressional district, represented by Democrat Jim McDermott, elected in 1988 and one of Congress's liberal members. Ed Murray is currently serving as mayor.
ground_truth: former Acting Mayor London Breed
sub_queries: What was Gregg Tafralis's city of birth? Answer: San Francisco
who was elected mayor of San Francisco in 2018 Answer: former Acting Mayor London Breed