Question: who is the longest serving manager in manchester united history
[{'answer': 'Sir Alex Ferguson', 'provenance': [{'wikipedia_id': '14267273', 'title': 'List of Manchester United F.C. managers', 'start_paragraph_id': 3, 'start_character': 78, 'end_paragraph_id': 3, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14267273', 'title': 'List of Manchester United F.C. managers', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 364, 'bleu_score': 0.9679895851501501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9719394286225724852}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43223', 'title': 'Alex Ferguson', 'section': 'Section::::Abstract.', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ['Ferguson was appointed manager of Manchester United in November 1986. During his 26 years with Manchester United he won 38 trophies, including 13 Premier League titles, five FA Cups, and two UEFA Champions League titles. He was knighted in the 1999 Queen\'s Birthday Honours list for his services to the game. Ferguson is the longest-serving manager of Manchester United, having overtaken Sir Matt Busby\'s record on 19 December 2010. He retired from management at the end of the 201213 season, having won the Premier League in his final season. Born to Alexander Beaton Ferguson, a plater\'s helper in the shipbuilding industry, and his wife, Elizabeth ("née" Hardie), Alex Chapman Ferguson was', 'Ferguson was appointed manager of Manchester United in November 1986. During his 26 years with Manchester United he won 38 trophies, including 13 Premier League titles, five FA Cups, and two UEFA Champions League titles. He was knighted in the 1999 Queen\'s Birthday Honours list for his services to the game. Ferguson is the longest-serving manager of Manchester United, having overtaken Sir Matt Busby\'s record on 19 December 2010. He retired from management at the end of the 201213 season, having won the Premier League in his final season. Born to Alexander Beaton Ferguson, a plater\'s helper in the shipbuilding industry, and his wife, Elizabeth ("née" Hardie), Alex Chapman Ferguson was']}}]}, {'provenance': [{'wikipedia_id': '14267273', 'title': 'List of Manchester United F.C. managers', 'section': 'Section::::Abstract.', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ["The longest-serving and most successful person to manage Manchester United is Sir Alex Ferguson, who won 13 Premier League titles, five FA Cups, four League Cups, 10 Community Shields, two UEFA Champions League titles, one UEFA Cup Winners' Cup, one UEFA Super Cup, one Intercontinental Cup and one FIFA Club World Cup in his managerial reign of more than 26 years.", "The longest-serving and most successful person to manage Manchester United is Sir Alex Ferguson, who won 13 Premier League titles, five FA Cups, four League Cups, 10 Community Shields, two UEFA Champions League titles, one UEFA Cup Winners' Cup, one UEFA Super Cup, one Intercontinental Cup and one FIFA Club World Cup in his managerial reign of more than 26 years.", "The longest-serving and most successful person to manage Manchester United is Sir Alex Ferguson, who won 13 Premier League titles, five FA Cups, four League Cups, 10 Community Shields, two UEFA Champions League titles, one UEFA Cup Winners' Cup, one UEFA Super Cup, one Intercontinental Cup and one FIFA Club World Cup in his managerial reign of more than 26 years."]}}]}, {'provenance': [{'wikipedia_id': '1139579', 'title': 'History of Manchester', 'section': 'Section::::20th century.:Post-war.\n', 'start_paragraph_id': 97, 'end_paragraph_id': 97, 'meta': {'evidence_span': ['Manchester United had won two league titles and a FA Cup in the first two decades of the 20th century, but the inter-war years had been blighted by a loss of form on the pitch and ongoing financial problems. The club\'s revival occurred with the appointment of Matt Busby as manager in 1945; he guided the club to a FA Cup triumph in 1948 and a league title in 1952. He then built a highly successful new side consisting of mostly young players (nicknamed the "Busby Babes" by the media) which went on to win two league titles and became the first English club to play in the new European Cup. Then tragedy struck in February 1958; eight of the club\'s players (three of them established England internationals; Roger Byrne, Tommy Taylor and Duncan Edwards) died as a result of the Munich air disaster on the return flight from a European Cup tie in Yugoslavia and two others injured to such an extent that they never played again. Busby, who was seriously injured in the crash, was left to build a new team. His new United side, built around Munich crash survivors including Bill Foulkes and Bobby Charlton, went on to dominate the English game in the 1960s, featuring new stars like Denis Law and George Best, winning two more league titles, a FA Cup and then the European Cup in 1968 - the first English club to win the trophy. Busby retired the following year after 24 years in charge. The club was less successful in the 1970s, its only major trophy of the decade being the FA Cup in 1977, and the club even spent a season outside the top division of English football. The 1980s were slightly more successful with a further two FA Cups wins and regular top four league finishes, but the club has enjoyed an unmatched run of success which began after the appointment of Alex Ferguson as manager in 1986. By the time Ferguson retired in 2013 after 27 years as manager, the club had won a further 13 league titles, five FA Cups, four League Cups and two European Cups. High-profile players to have played for the club during Sir Alex Ferguson\'s management (he was knighted in 1999) include Bryan Robson, Mark Hughes, Ryan Giggs, Eric Cantona, David Beckham and Wayne Rooney. Manchester City had been league champions once and FA Cup winners twice by 1939, but enjoyed further success in the post-war years, starting with an FA Cup win in 1956. The club\'s biggest success came more', 'Manchester United had won two league titles and a FA Cup in the first two decades of the 20th century, but the inter-war years had been blighted by a loss of form on the pitch and ongoing financial problems. The club\'s revival occurred with the appointment of Matt Busby as manager in 1945; he guided the club to a FA Cup triumph in 1948 and a league title in 1952. He then built a highly successful new side consisting of mostly young players (nicknamed the "Busby Babes" by the media) which went on to win two league titles and became the first English club to play in the new European Cup. Then tragedy struck in February 1958; eight of the club\'s players (three of them established England internationals; Roger Byrne, Tommy Taylor and Duncan Edwards) died as a result of the Munich air disaster on the return flight from a European Cup tie in Yugoslavia and two others injured to such an extent that they never played again. Busby, who was seriously injured in the crash, was left to build a new team. His new United side, built around Munich crash survivors including Bill Foulkes and Bobby Charlton, went on to dominate the English game in the 1960s, featuring new stars like Denis Law and George Best, winning two more league titles, a FA Cup and then the European Cup in 1968 - the first English club to win the trophy. Busby retired the following year after 24 years in charge. The club was less successful in the 1970s, its only major trophy of the decade being the FA Cup in 1977, and the club even spent a season outside the top division of English football. The 1980s were slightly more successful with a further two FA Cups wins and regular top four league finishes, but the club has enjoyed an unmatched run of success which began after the appointment of Alex Ferguson as manager in 1986. By the time Ferguson retired in 2013 after 27 years as manager, the club had won a further 13 league titles, five FA Cups, four League Cups and two European Cups. High-profile players to have played for the club during Sir Alex Ferguson\'s management (he was knighted in 1999) include Bryan Robson, Mark Hughes, Ryan Giggs, Eric Cantona, David Beckham and Wayne Rooney. Manchester City had been league champions once and FA Cup winners twice by 1939, but enjoyed further success in the post-war years, starting with an FA Cup win in 1956. The club\'s biggest success came more']}}]}]