Question: In 2011, which of the nine official regions of England abolished the Blackburn with Darwen tPCT in April 2013?

full_context: Document 1: Greater Manchester Built-up Area: The Greater Manchester Built-up Area is an area of land defined by the Office for National Statistics (ONS), consisting of the large conurbation that encompasses the urban element of the city of Manchester and the continuous metropolitan area that spreads outwards from it, forming much of Greater Manchester in North West England. According to the United Kingdom Census 2011, the Greater Manchester Built-up Area has a population of 2,553,379 making it the second most populous conurbation in the United Kingdom after the Greater London Built-up Area and the thirteenth largest in the European Union. This was an increase of 14% from the population recorded at the United Kingdom Census 2001 of 2,240,230, when it was known as the Greater Manchester Urban Area.
Document 2: Girlguiding North West England: Girlguiding North West England is one of the nine Countries and Regions of Girlguiding UK. It is further subdivided into 17 Girlguiding Counties. These are not the same as the counties defined by the British government. The region was introduced in 1960 covering the Counties of Cumberland, Westmorland, Cheshire, Lancashire, plus the Isle of Man, with the headquarters in Preston. It is also known, for example to the Charity Commissioners, as the Guide Association North West England.
Document 3: Cheshire: Cheshire ( or ; archaically the County Palatine of Chester) is a county in North West England, bordering Merseyside and Greater Manchester to the north, Derbyshire to the east, Staffordshire and Shropshire to the south and Wales to the west. Cheshire's county town is Chester; the largest town is Warrington.
Document 4: Blackburn with Darwen Teaching Primary Care Trust: Blackburn with Darwen tPCT was a UK National Health Service Primary Care Trust, responsible for commissioning & purchasing of health care in Blackburn with Darwen in Lancashire. It came under the North West of England's NHS Strategic Health Authority (SHA). It was abolished in April 2013.
Document 5: Blackburn: Blackburn is a large town in Lancashire, England. It lies to the north of the West Pennine Moors on the southern edge of the Ribble Valley, 9 mi east of Preston, 20.9 mi NNW of Manchester and 9 mi north of the Greater Manchester border. Blackburn is bounded to the south by Darwen, with which it forms the unitary authority of Blackburn with Darwen; Blackburn is its administrative centre. At the time of the UK Government's 2001 census, Blackburn had a population of 105,085, whilst the wider borough of Blackburn with Darwen had a population of 140,700. Blackburn had a population of 117,963 in 2011, a massive increase since 2001.
Document 6: North Cumbria University Hospitals NHS Trust: North Cumbria University Hospitals NHS Trust was created in April 2001 by merging Carlisle Hospitals NHS Trust and West Cumbria Healthcare NHS Trust. It runs Cumberland Infirmary in Carlisle, Cumbria, Penrith Hospital and West Cumberland Hospital in Whitehaven, England. In January 2012, the Trust decided that its preferred future was as part of Northumbria Healthcare NHS Foundation Trust.
Document 7: Borough of Halton: Halton is a local government district in the ceremonial county of Cheshire in North West England, with borough status and administered by a unitary authority. It was created in 1974 as a district of the non-metropolitan county of Cheshire, and became a unitary authority area on 1 April 1998. Since 2014 it has been a member of the Liverpool City Region Combined Authority. The borough consists of the towns of Runcorn and Widnes and the civil parishes of Hale, Daresbury, Moore, Preston Brook, Halebank and Sandymoor. The district borders Merseyside, Warrington and Cheshire West and Chester. The borough straddles the River Mersey – the area to the north (including Widnes) is historically part of Lancashire, that to the south (including Runcorn) part of Cheshire.
Document 8: North West England: North West England, one of nine official regions of England, consists of the five counties of Cheshire, Cumbria, Greater Manchester, Lancashire and Merseyside. The North West had a population of 7,052,000 in 2011. It is the third most populated region in the United Kingdom after the South East and Greater London.
Document 9: South West England: South West England is one of nine official regions of England. It is the largest in area, covering 9200 sqmi and the counties of Gloucestershire, Bristol, Wiltshire, Somerset, Dorset, Devon and Cornwall, as well as the Isles of Scilly. Five million people live in South West England.
Document 10: Lower Darwen: Lower Darwen is a village in the unitary borough of Blackburn with Darwen, contiguous with the town of Darwen, in the county of Lancashire. It is located between the towns of Blackburn and Darwen. Nearby places include Ewood and Blackamoor. It is situated in the valley of the River Darwen. The former township of Lower Darwen, abolished in the 1890s, extended south to Earnsdale Brook, and included areas now in the town of Darwen.
Document 11: Bill Taylor (English politician): Sir Bill Taylor (born 1952) is the former leader of Blackburn with Darwen Council in England and election agent for Blackburn MP and former Justice Minister Jack Straw from 1979 to 2010. He was Mayor of the Borough of Blackburn from 1989–90 and was knighted in 2003 for services to local government. From its creation in the late 1990s, Blackburn with Darwen was Council of the Year twice. He was approached to assume the role of Chair of 3rd Sector Lancashire to coordinate Lancashire's 4,500+ voluntary groups. From 2009 till 2013 he chaired the Blackburn with Darwen ground breaking NHS Care Trust Plus.
Document 12: Yorkshire and the Humber: Yorkshire and the Humber is one of nine official regions of England at the first level of NUTS for statistical purposes. It comprises most of Yorkshire (South Yorkshire, West Yorkshire, the East Riding of Yorkshire including Hull, the shire county of North Yorkshire and the City of York), North Lincolnshire and North East Lincolnshire. It does not include Middlesbrough or Redcar and Cleveland (which are in the ceremonial county of North Yorkshire but not in the shire county). The population in 2011 was 5,284,000.
Document 13: Darwen railway station: Darwen railway station serves Darwen, a town in Lancashire, England. It was opened in 1847 by the "Bolton, Blackburn, Clitheroe & West Yorkshire Railway", which was subsequently taken over by the Lancashire and Yorkshire Railway twelve years later. It is now served by Northern services on the Ribble Valley Line from Manchester Victoria/Bolton to Blackburn and into Clitheroe.
Document 14: North East England: North East England is one of nine official regions of England at the first level of NUTS for statistical purposes. It covers Northumberland, County Durham, Tyne and Wear, and the area of the former county of Cleveland in North Yorkshire. The region is home to three large conurbations: Teesside, Wearside, and Tyneside, the latter of which is the largest of the three and the eighth most populous conurbation in the United Kingdom. There are only three cities in the region; Newcastle upon Tyne is the largest city in the region with a population of just under 280,000, followed by Sunderland, both of which are located in the metropolitan county of Tyne and Wear. The city of Durham is the county town of County Durham. Other large settlements in the region include Darlington; Gateshead; Hartlepool; Middlesbrough; South Shields; Stockton-on-Tees and Washington. In common parlance, and geographically, more of north Yorkshire would usually be regarded as part of north-east England.
Document 15: Blackburn with Darwen: Blackburn with Darwen is a unitary authority area in Lancashire, North West England. It consists of Blackburn, the small town of Darwen to the south of it, and the surrounding countryside. The population of the Unitary Authority taken at the 2011 census was 147,489.
ground_truth: North West England