Question: In the 2015 FA Cup Final, which team did a player nicknamed "the BFG" play for?

<P0-S0> Per Mertesacker (] ; born 29 September 1984) is a German professional footballer who plays as a centre back for Premier League club Arsenal. <P0-S1>  He also played for the Germany national team but retired in August 2014 after winning the World Cup. <P0-S2>  Mertesacker is a youth product of Hannover 96 and he made his senior league debut in November 2003. <P0-S3>  He was soon dubbed "the Defence Pole" (""die Abwehrlatte"") by German tabloids and gained a reputation for his good disciplinary record, going 31 Bundesliga games without being booked. <P0-S4>  Since joining Arsenal, their fans have nicknamed him "the BFG", which is short for "Big Fucking German" and an allusion to Roald Dahl's "The BFG" due to his height. <P0-S5>  He has been described as an imposing, reliable, dominant and an accomplished defender. <SEP> <P1-S0> Sunderland Association Football Club was founded in 1879 as Sunderland & District Teachers Association Football Club by James Allan. <P1-S1>  They turned professional in 1885. <P1-S2>  Sunderland won their first Football League championship in the 1891–92 season two years after joining the league. <P1-S3>  They won the next Football League First Division on three occasions in four seasons; in 1892, 1893 and 1895, separated by a runner-up spot in 1894. <P1-S4>  In the 1901–02 season, Sunderland won their fifth Football League First Division championship. <P1-S5>  They came close to completing the "league and cup double" in the 1912–13 season, winning the league but losing to Aston Villa in the 1913 FA Cup Final. <P1-S6>  The team's next success came in the 1935–36 season when they won the League Championship and also the Charity Shield. <P1-S7>  They had not won the FA Cup until the 1936–37 season when they defeated Preston North End in the 1937 FA Cup Final. <P1-S8>  Sunderland entered The Football League in 1890 and were not relegated from the top division until the 1957–58 season; a total of 58 seasons in the highest division of England. <P1-S9>  Their next trophy came in the 1973 FA Cup Final as they beat Leeds United 1–0. <P1-S10>  They reached the 1985 Football League Cup Final but finished as runners-up to Norwich City after being beaten 1–0. <P1-S11>  In the 1986–87 season Sunderland were relegated to the Football League Third Division for the first time in their history under the management of Lawrie McMenemy, they however, returned to the second division the following season as champions–their lowest position in the English football league system. <P1-S12>  Their first appearance in the Premier League came in the 1999–2000 season after being promoted as champions from Division One. <P1-S13>  In winning promotion the club gained 105 points, which was a record at the time. <P1-S14>  Sunderland gained just 15 points in the 2005-06 season, which set the record for the lowest number of points in a Premier League season, which has since been eclipsed by Derby County. <SEP> <P2-S0> The 2013 FA Cup Final was the 132nd final of the FA Cup, the world's oldest football cup competition. <P2-S1>  The match, contested by Manchester City and Wigan Athletic, took place on 11 May 2013 at Wembley Stadium in London, and kicked off at 5:15 p.m. <P2-S2>  It was Wigan's first FA Cup final and Manchester City's 10th. <P2-S3>  Wigan pulled off a shock victory against favourites City, winning in circumstances reminiscent of the 1988 FA Cup Final when Wimbledon overcame Liverpool. <P2-S4>  Ben Watson's stoppage-time headed goal produced the "greatest FA Cup Final upset for a quarter of a century". <P2-S5>  In the United Kingdom, the match was televised by ITV and ESPN. <SEP> <P3-S0> The 2015 FA Cup Final was the 134th final of the FA Cup, the world's oldest football cup competition. <P3-S1>  The match was contested by Arsenal and Aston Villa at Wembley Stadium in London. <P3-S2>  The match was played on 30 May 2015 and was the final match of the competition. <P3-S3>  Arsenal won the match 4–0 with goals from Theo Walcott, Alexis Sánchez, Per Mertesacker and Olivier Giroud, for a record 12th title. <P3-S4>  This was the sixth FA Cup win for manager Arsène Wenger, putting him in joint-first place for wins with George Ramsay.