Question: What FIFA World Cup did the referee of the 28 May 2011 football match at Wembley Stadium participate in? 

Context paragraphs:
Statue of Bobby Moore, Wembley: The Bobby Moore statue is a bronze sculpture of the former West Ham and England footballer Bobby Moore, situated outside England's national stadium, Wembley Stadium, in Wembley Park, north-west London.  It commemorates the life of Moore, who captained the only England side ever to win the World Cup, defeating Germany 4-2 in the 1966 FIFA World Cup Final held in England at the old Wembley Stadium, demolished in 2003.  Commissioned by the Football Association, it was unveiled outside the new stadium when it opened in 2007, fourteen years after Moore's death from cancer, aged 51.  Standing 20 ft tall on a stone plinth, it looks over spectators as they walk down Wembley Way into the stadium.  Sculpted by the Royal Sculptor Philip Jackson, it is Jackson's second piece featuring Moore, after the "World Cup Sculpture" unveiled in 2003.

1923 FA Cup Final: The 1923 FA Cup Final was an association football match between Bolton Wanderers and West Ham United on 28 April 1923 at the original Wembley Stadium in London.  The showpiece match of English football's primary cup competition, the Football Association Challenge Cup (better known as the FA Cup), it was the first football match to be played at Wembley Stadium.  King George V was in attendance to present the trophy to the winning team.

2002 FIFA World Cup Final: The 2002 FIFA World Cup Final was a football match that took place on 30 June 2002 at the International Stadium in Yokohama to determine the winner of the 2002 FIFA World Cup.  The final was contested by Germany and Brazil.  It was the first World Cup meeting between the two sides.  Brazil won the match 2–0, winning a record fifth title.  Ronaldo, who became the record World Cup goalscorer at the 2006 tournament, scored two of his fifteen World Cup goals in the second half of the match, leading Brazil to the title and winning the Golden Boot award.  It also marked Brazilian captain Cafu's third consecutive appearance in a World Cup Final, a feat that has yet to be accomplished by any other player in the history of the tournament.  Both teams had won their respective groups before advancing to the knockout stage, where Germany shut out all of their opponents to reach the final, while Brazil only allowed a single goal from England.  Germany overcame United States and co-host South Korea, while Brazil knocked out England and Turkey.

Viktor Kassai: Viktor Kassai ("Kassai Viktor", : ; born 10 September 1975) is a Hungarian football referee.  He participated in the 2010 FIFA World Cup and refereed the 2011 UEFA Champions League Final.  He has been a full international referee for FIFA since 2003.

2011 Football League Cup Final: The 2011 Football League Cup Final was the final match of the 2010–11 Football League Cup, the 51st season of the Football League Cup, a football competition for the 92 teams in the Premier League and the Football League.  The match was contested by Arsenal and Birmingham City, at Wembley Stadium in London, on 27 February 2011.  It was broadcast live on the BBC and Sky Sports.  Birmingham City won the game 2–1 and were guaranteed a spot in the third qualifying round of the 2011–12 UEFA Europa League.  Mike Dean was the referee.

2011 Football League Championship play-off Final: The 2011 Football League Championship play-off final was a football match contested by Reading and Swansea City on 30 May 2011 at Wembley Stadium to decide the third team to be promoted from the Championship to the Premier League for the 2011–12 season.

Carlos Vera: Carlos Alfredo Vera Rodríguez (born June 25, 1976) is an Ecuadorian football referee.  He has been an international referee since 2006.  He has officiated matches in FIFA World Cup qualifiers, the Copa Libertadores, the Copa Sudamericana and the South American Youth Football Championship.  He was selected as a referee for the 2011 Copa América in Argentina and the 2015 Copa America in Chile.  In addition, he was appointed by FIFA to take charge of matches at the 2012 FIFA Club World Cup and the 2014 FIFA World Cup.  He was selected as the fourth official for the 2014 FIFA World Cup Final.

2011 UEFA Champions League Final: The 2011 UEFA Champions League Final was a football match played on 28 May 2011 at Wembley Stadium in London that decided the winner of the 2010–11 season of the UEFA Champions League.  The winners received the European Champion Clubs' Cup (the European Cup).  The 2011 final was the culmination of the 56th season of the tournament, and the 19th in the Champions League era.

1966 FIFA World Cup Final: The 1966 FIFA World Cup Final was the final match in the 1966 FIFA World Cup, the eighth football World Cup and one of the most controversial finals ever.  The match was played by England and West Germany on 30 July 1966 at Wembley Stadium in London, and had an attendance of 96,924.  The British television audience peaked at 32.30 million viewers, making the final the most watched television event ever in the United Kingdom.

2008 FA Cup Final: The 2008 FA Cup Final was a football match held at Wembley Stadium on 17 May 2008 and was the final match of the 2007–08 FA Cup competition.  The match was the 127th FA Cup Final, and the second to be held at the new Wembley Stadium since its redevelopment.  The match was contested by Portsmouth and Cardiff City, with Portsmouth winning 1–0.  This was the first time that the two sides have ever met in the competition.  Both teams were aiming to win the FA Cup for the second time, Cardiff having won it in 1927 and Portsmouth in 1939.  Had Cardiff won, they would have been the first club from outside the top division of English football to have won the competition since West Ham United in 1980.  The match had an attendance of 89,874, a record which still stands as the largest ever for an FA Cup Final at the new Wembley Stadium.

Supporting paragraphs: Viktor Kassai 2011 UEFA Champions League Final
Answer: 2010 FIFA World Cup