Question: Who scored the first goal of Ron Harris's team last season?

full_context: Document 1: History of Arsenal F.C. (1966–present): The 2016 / 17 season was one of Arsenal's most testing for competitions in Europe, having taken a race with Liverpool and Manchester City to the final day of the season. Despite winning 3 - 1 against Everton, results elsewhere meant they only finished fifth, missing out on a Champions League spot for the first time in two decades. However Arsenal won the FA Cup Final 2 - 1 against Chelsea. This was their third win in four seasons and made them the most successful club in the history of the competition.
Document 2: Gary Chivers: A central defender, Chivers began his career with Chelsea in 1979, and remained with the club until 1983, a poor period in the club's history. He then moved to Swansea City, followed by spells with Queens Park Rangers and Watford. He settled at Brighton & Hove Albion, enjoying a six-year stint with the club from 1987. He spent the summer of 1993 playing in Norway with Lyn Oslo before playing out his career at Bournemouth, retiring from professional football in 1995. He played non-league football in Sussex, becoming a chauffeur (with his own stretch-limo) for a living in Surrey before going on to work in the football-related media and in private coaching.
Document 3: Allan Harris: Harris was a full-back and began his career with Chelsea, for whom he played 70 league games in his first stint with the club. He joined Coventry in 1964, spending two years there, before briefly returning to Chelsea again, where he played in their 1967 FA Cup final loss to Tottenham Hotspur.
Document 4: Ron Harris (footballer): Ronald Edward Harris (born 13 November 1944 in Hackney, London, England), known by the nickname "Chopper", is a former English footballer who played for Chelsea in the 1960s and 1970s. Harris is widely regarded as one of the toughest defenders of his era – along with players such as Tommy Smith and Norman Hunter – hence the nickname. His brother Allan Harris was also a professional footballer and they were teammates at Chelsea in the mid-1960s.
Document 5: Laurent Charvet: Charvet began his career at Cannes in 1994. Between then and 1997 he appeared 99 times for the club and scored 19 goals. In the 1997–98 season he was loaned out to the English Premier League team Chelsea for whom he appeared 11 times, scoring two goals in defeats to West Ham and Leeds. He was an unused substitute in Chelsea's UEFA Cup Winners' Cup final win over VfB Stuttgart.
Document 6: Wayne Rooney: During the first half of the 2006 -- 07 season, Rooney endured a ten - game scoreless streak before scoring a hat - trick against Bolton Wanderers. He subsequently signed a two - year contract extension the following month that tied him to United until 2012. In April 2007, he scored two goals in an 8 -- 3 aggregate Champions League quarter - final win over Roma and two more in the same competition later in the month, in a 3 -- 2 semi-final first leg victory over Milan. Rooney collected his first Premier League title winner's medal at the end of the 2006 -- 07 season. He scored 14 league goals that season.
Document 7: 2016–17 Chelsea F.C. season: Chelsea lost its first pre-season match, against Rapid Wien, which ended in a 2 -- 0 defeat. In the following match of its Austrian tour, Chelsea won 3 -- 0 against Wolfsberger AC, with youngsters Bertrand Traoré, Ruben Loftus - Cheek and Nathaniel Chalobah each scoring a goal. The following day, Chelsea had a closed - door friendly with local team Atus Ferlach, ending its Austrian tour with an 8 -- 0 win over the champions of the Austrian fourth - tier Kärntner Liga.
Document 8: Harry Harris (footballer): Harris moved to Portsmouth in 1958 making 380 appearances, scoring 48 goals. In 1971, he returned briefly to Newport on loan. In total Harris made 172 appearances for Newport scoring 59 goals.
Document 9: Ryan Bertrand: Born in Southwark, London, Bertrand began his youth career at Gillingham, before signing for Chelsea in July 2005. He graduated from Chelsea's youth system and was sent on loan to various clubs between 2006 and 2010. He made his full debut for Chelsea on 20 April 2011, six years after joining them, in a fixture against Birmingham City. In the 2011–12 season, Bertrand signed a new four-year contract with Chelsea and was made understudy to Ashley Cole, whom he described a "fantastic role model." On 19 May 2012, Bertrand became the first player to make his Champions League debut in the final, starting in an unfamiliar left wing role in front of Cole; Chelsea beat Bayern Munich 4–3 on penalties. He has honours with Chelsea, including an FA Cup and UEFA Champions League titles.
Document 10: History of Arsenal F.C. (1966–present): For the following season, Arsenal gradually progressed upon their league form, eventually becoming runners - up in 2016. In order to capture that ever - elusive Premier League title for the first time in 12 years, the club spent heavily in the transfer market in the summer of 2016, spending over £80 million on four first - team acquisitions, namely capturing Shkodran Mustafi and Granit Xhaka, who operate as a central defender and central midfielder, respectively. Both positions were long deemed problem positions in the team, with the hope Arsenal could push on and win the league after signing the pair. However, poor league form saw Arsenal competing heavily for the final UEFA Champions League space, having taken a race with Liverpool and Manchester City to the final day of the season. Despite winning 3 - 1 against Everton, results elsewhere meant they only finished fifth, missing out on a Champions League spot for the first time in two decades, and the first ever under Wenger. However, Arsenal won the FA Cup Final 2 - 1 against Chelsea, making it their third win in four seasons, and made them the most successful club in the history of the competition.
Document 11: 1985–86 Chelsea F.C. season: It was the first season under the management of John Hollins, who had previously been a member of Chelsea's victories in the 1970 FA Cup Final and 1971 European Cup Winners' Cup Final. On 1 January 1986 Chelsea were second, two points behind leaders Manchester United and in March the club were still in second, four points behind Everton with two games in hand. The two games in hand were lost 4–0 at home to West Ham United and 6–0 away at Queens Park Rangers. After gaining just 9 points from a possible 33 in the last 11 games, Chelsea finished 6th for the second season in succession.
Document 12: Carl Hoddle: The younger brother of England international Glenn Hoddle, Carl began his career with Tottenham Hotspur in 1984. After two years he moved to Barnet, where he stayed until 1988 before moving to Bishop's Stortford in a swap deal for former Barnet player Ian Fergusson. After one season he was signed by Leyton Orient, where he played 29 times, before returning to Barnet in 1991, ending his senior career in 1995 after 100 appearances. He also had a spell with Conference National side Woking. One notable game he played for the Bees was in the FA Cup against Chelsea in 1994, who were at the time managed by his older brother. He later worked in the used car trade and as a pub landlord before joining his older brother as a coach and scout at Wolverhampton Wanderers between 2004 and 2006. He died on 2 March 2008 after he was found collapsed in his home from what was initially suspected to be a heart attack but later confirmed as a brain aneurysm.
Document 13: Chelsea F.C.: In July 2003, Bates sold Chelsea to Russian billionaire Roman Abramovich for £140 million. Over £100 million was spent on new players, but Ranieri was unable to deliver any trophies, and was replaced by José Mourinho. Under Mourinho, Chelsea became the fifth English team to win back-to-back league championships since the Second World War (2004–05 and 2005–06), in addition to winning an FA Cup (2007) and two League Cups (2005 and 2007). After a poor start to the 2007–2008 season, Mourinho was replaced by Avram Grant, who led the club to their first UEFA Champions League final, which they lost on penalties to Manchester United.
Document 14: Derrick Harris: Sidney Derrick Harris is a former professional American football player who played running back for four seasons for the St. Louis Rams and San Diego Chargers.
Document 15: Bob Chapman: Bob Chapman (full name Robert Dennis Chapman, but who was often known as Sammy Chapman – born 18 August 1946) is a footballer who played as a defender in the Football League during the 1960s and 1970s, most notably with Nottingham Forest.
ground_truth: Bertrand Traoré
sub_queries: Ron Harris >> member of sports team Answer: Chelsea
who scored Chelsea 's first goal last season Answer: Bertrand Traoré