Question: Which team involved in the Manchester Derby plays at Vity of Manchester Stadium?

Context paragraphs:
Manchester derby: The Manchester derby refers to football matches between Manchester City and Manchester United, first contested in 1881.  Manchester City play at the Etihad Stadium, while Manchester United play at Old Trafford.  The teams have played 174 matches in all competitions, United winning 72, City 50, and the remaining 52 having been drawn.

List of Manchester City F.C. seasons: Manchester City is an English professional association football club based in Manchester, who currently play in the Premier League.  The list covers the period from 1891 (when the club, then known as "Ardwick", joined the Football Alliance) to the present day.  It details the club's achievements in senior league and cup competitions, and the top scorers for each season.  The club was renamed Manchester City F.C in 1894, and moved to Maine Road in 1923.  Since 2003 the club has played at the City of Manchester Stadium.  Manchester City biggest rivals are Manchester United, whenever they play it is considered the Manchester Derby.

John Grimwood: John Barton "Jack" Grimwood (25 October 1898 – 1977) was an English footballer who played as a half-back.  He joined Manchester United in May 1919, and made his debut for the club in the first Manchester derby on 11 October 1919, as a replacement for Lal Hilditch, who was away on international duty.  Able to play in all three half-back positions, he was a utility player for the club.  He helped United gain promotion to the First Division in the 1924-25 season.  However, he suffered a knee injury for most of the next season, and needed to undergo an operation.  In 1925-26, he played at centre-half regularly, sharing the position with Frank Barson.  After scoring eight goals in 205 appearances for United, he left the club for Aldershot Town in June 1927.  He later joined Blackpool and Altrincham.  He later worked in the milk industry.

2011 FA Community Shield: The 2011 FA Community Shield was the 89th FA Community Shield, an annual football match contested by the winners of the previous season's Premier League and FA Cup competitions.  The match was the 160th Manchester derby between Manchester United and Manchester City and played at Wembley Stadium, London, on 7 August 2011.  Manchester United won the game 3–2, with goals from Chris Smalling and Nani (2), after Joleon Lescott and Edin Džeko had put City 2–0 up at half-time.

Billy Walsh (Irish footballer): William "Billy" Walsh (31 May 1921 – 28 July 2006), also referred to as Willie Walsh, was an Irish footballer.  Walsh played for several clubs, but most notably with Manchester City, for whom he made more than 100 appearances.  As an international, Walsh represented four national teams: after playing for the England Schoolboys XI, he then became a dual Irish international, playing for both Ireland teams – the FAI XI and the IFA XI.  In 1949, he was a member of the FAI XI that defeated England 2–0 at Goodison Park, becoming the first non-United Kingdom team to beat England at home.  He then emigrated to New Zealand and also played in an unofficial game for their national team.  Walsh eventually moved to Australia and settled in Noosa, Queensland.  In 2003, he and several other former Manchester City players returned for the last game at Maine Road.  He died on 28 July 2006 at the age of 85 and his ashes were interred at the Garden of Remembrance at the City of Manchester Stadium.

Sport in Manchester: Manchester City and Manchester United are popular Premier League football clubs in Manchester, United's ground is in Old Trafford, and fixtures between the clubs are referred to as the Manchester Derby.  In 2012, City finished first and United second in the Premier League.  Manchester has hosted every major domestic, continental and international football competition, including the World Cup in 1966, the European Championship in 1996, Olympic Football in 2012, the 2003 UEFA Champions League Final, the 2008 UEFA Cup Final, 1893, 1911, 1915 and 1970 FA Cup Finals and 1977, 1978 and 1984 Football League Cup Final.

Manchester City F.C.: Manchester City Football Club is a football club in Manchester, England.  Founded in 1880 as St. Mark's (West Gorton), they became Ardwick Association Football Club in 1887 and Manchester City in 1894.  The club moved to the City of Manchester Stadium in 2003, having played at Maine Road since 1923.

Ken Mulhearn: Mulhearn started his career as an apprentice at Everton but did not make the first team, and moved into the lower divisions with Stockport County, where he made 100 appearances.  He was signed by First Division Manchester City on 21 September 1967, a transfer which Stockport great Len Allchurch later reflected on by saying "...a great 'keeper.  We never thought we'd replace him when he went to City".  Two days later Manchester City's first choice goalkeeper Harry Dowd sustained an injury, and Mulhearn took his place in the team, his debut coming in a Manchester derby.  He kept his place for the remainder of the season, gaining a League Championship medal as part of Manchester City's 1967–68 title-winning side.

City of Manchester Stadium: The City of Manchester Stadium in Manchester, England, also known as the Etihad Stadium for sponsorship reasons, is the home ground of Manchester City Football Club and, with a domestic football capacity of 55,097, the fourth-largest in the Premier League and eighth-largest in the United Kingdom.

2011 Conference Premier play-off Final: The 2011 Conference Premier play-off Final, known as the 2011 Blue Square Bet Premier play-off Final for sponsorship purposes, was a football match between AFC Wimbledon and Luton Town on 21 May 2011 at the City of Manchester Stadium in Manchester.  It was the ninth Conference Premier play-off Final and the first to be played at the City of Manchester Stadium.  AFC Wimbledon won the match 4–3 in a penalty shoot-out following a 0–0 draw after extra time to secure promotion to Football League Two, thus entering the Football League for the first time in the club's nine-year history.

Supporting paragraphs: Manchester derby City of Manchester Stadium
Answer: Manchester City