Given the question: Information: - Barry Hearn ( born 19 June 1948 ) is an English sporting events promoter and the founder and chairman of promotions company Matchroom Sport . Through Matchroom , Hearn is also involved in many sports , including pool , tenpin bowling , golf ( see PGA EuroPro Tour ) , Table Tennis and fishing . Hearn is currently the chairman of the Professional Darts Corporation , and was also until July 2010 chairman of the World Professional Billiards and Snooker Association ( WPBSA ) . Also , until July 2014 , was the chairman of Leyton Orient F.C. - Matchroom Sport is a sport event promotions company led by the founder and owner English entrepreneur Barry Hearn and his son Eddie. It first came to attention in the sports of snooker and boxing and is also involved in pool, bowling, golf (see PGA EuroPro Tour), fishing, darts, ping pong, and poker and as of late 2016 gymnastics. The company is based in Brentwood, Essex. - Darts is a form of throwing sport in which small missiles are thrown at a circular dartboard fixed to a wall. Though various boards and rules have been used in the past, the term "darts" usually now refers to a standardised game involving a specific board design and set of rules. As well as being a professional competitive sport, darts is a traditional pub game, commonly played in Britain and Ireland, across the Commonwealth, the Netherlands, Germany, the Scandinavian countries, the United States, and elsewhere. - The PGA EuroPro Tour is a men's developmental professional golf tour. It was created in 2002 by the merger of two development tours, the EuroPro Tour and the PGA MasterCard Tour. It is based mainly in the United Kingdom, with a few events in other countries. Most of the players are British, with others coming from Ireland, Continental Europe, Australia, New Zealand and South Africa. Beginning in July 2015, the four third-level tours will carry Official World Golf Ranking points. - Brentwood is a town in and the principal settlement of the Borough of Brentwood, in the county of Essex in the East of England. It is located in the London commuter belt, 20 miles (30km) east-north-east of Charing Cross, and near the M25 motorway. According to the 2011 Census the town had a population of 49,463. After reading the paragraphs above, choose the best answer for the entity that related to 'barry hearn' with the relationship of 'country of citizenship'. Choices: - australia - british - england - germany - ireland - netherlands - united kingdom
The answer is:
england