Question: Who resigned as the Welsh Assembly Member for the North Wales region to represent Eddisbury in the House of Commons in the UK Parliament in 2015?

full_context: Document 1: South Cambridgeshire (UK Parliament constituency): South Cambridgeshire is a constituency represented in the House of Commons of the UK Parliament by Heidi Allen, a Conservative, since May 2015.
Document 2: Congleton (UK Parliament constituency): Congleton is a constituency in Cheshire, represented in the House of Commons of the UK Parliament since 2010 by Fiona Bruce of the Conservative Party.
Document 3: Eddisbury (UK Parliament constituency): Eddisbury is a constituency in Cheshire represented in the House of Commons of the UK Parliament since 2015 by Antoinette Sandbach, a Conservative.
Document 4: Antoinette Sandbach: Antoinette Geraldine Mackeson-Sandbach (born 15 February 1969), known in politics as Antoinette Sandbach, is a Conservative Party politician who was elected as the Member of Parliament for Eddisbury at the 2015 general election. The following day, 8 May 2015, she resigned as the Welsh Assembly Member for the North Wales region. having been elected as a North Wales regional Assembly Member at the May 2011 election.
Document 5: Caroline Dinenage: Caroline Julia Dinenage (born 28 October 1971) is an English Conservative Party politician who was elected as Member of Parliament (MP) for Gosport at the 2010 general election. She was re-elected in 2015 and 2017. In July 2014, she was appointed as Parliamentary Private Secretary (PPS) to the Minister for Women and Equalities, Nicky Morgan. In May 2015, Dinenage was appointed to the dual roles of Parliamentary Under Secretary of State at the Ministry of Justice and Minister for Women and Equalities at the Department for Education. In July 2016, Dinenage was appointed Parliamentary Under Secretary of State for Women, Equalities and Early Years at the Department for Education.
Document 6: Ann Winterton: Jane Ann, Lady Winterton (née Hodgson; born 6 March 1941 in Sutton Coldfield) is a British Conservative Party politician who was the Member of Parliament (MP) for Congleton from 1983 to 2010. She is married to Sir Nicholas Winterton, also a former Conservative MP.
Document 7: Crewe and Nantwich by-election, 2008: The Crewe and Nantwich by-election, 2008 was a parliamentary by-election held on 22 May 2008, for the British House of Commons constituency of Crewe and Nantwich, in Cheshire, England. The election was won by the Conservative party candidate Edward Timpson, who defeated the Labour party candidate Tamsin Dunwoody, on a swing from Labour to Conservative of 17.6%, a swing that in a general election would see nine Labour cabinet ministers lose their seats. At the time of the by-election, a swing of 7% in a general election would have seen the Conservatives gain an overall majority over Labour. This was the first seat gained by the Conservatives in a by-election since the Mitcham and Morden by-election, 1982.
Document 8: Banbury (UK Parliament constituency): Banbury is a constituency in Oxfordshire created in 1553 and represented in the House of Commons of the UK Parliament since 2015 by Victoria Prentis of the Conservative Party. The constituency is commonly, but erroneously, referred to as the North Oxfordshire constituency.
Document 9: Crewe and Nantwich (UK Parliament constituency): Crewe and Nantwich is a constituency in Cheshire represented in the House of Commons of the UK Parliament since 2017, by Laura Smith of the Labour Party.
Document 10: Fiona Bruce (politician): Fiona Claire Bruce (born 26 March 1957) is a British Conservative Party politician who is the Member of Parliament for Congleton, elected at the 2010 general election, and then again in 2015.
Document 11: Edward Timpson: Anthony Edward Timpson (born (1973--)26 1973 ) is a British Conservative Party politician. He was first elected as the Member of Parliament (MP) for Crewe and Nantwich at the 2008 by-election but lost his seat in the 2017 general election to the Labour candidate, Laura Smith.
Document 12: Altaf Hussain (Welsh politician): Dr Altaf Hussain was a Welsh Conservative regional Assembly Member in the National Assembly for Wales from 2015 to 2016. He is a retired consultant orthopaedic surgeon. Prior to dissolution of the fourth assembly, he sat on the Health Committee at the National Assembly for Wales, and was Shadow Minister for Social Services. He was defeated in the 2016 Welsh Assembly elections. In 2017 he was elected to Bridgend County Borough Council.
Document 13: Chipping Barnet (UK Parliament constituency): Chipping Barnet is a constituency created in 1974 represented in the House of Commons of the UK Parliament since 2005 by Theresa Villiers of the Conservative Party.
Document 14: Victoria Atkins: Victoria Mary Atkins (born 22 March 1976) is a British Conservative Party politician. She has been the Member of Parliament (MP) for Louth and Horncastle since the May 2015 general election.
Document 15: Alan Mak (politician): Alan Mak (born 1984) is a British Conservative Party politician who was elected as the Member of Parliament (MP) for the Havant constituency in Hampshire in 2015. He is the first person of Chinese and East Asian origin to be elected to the House of Commons of the United Kingdom.
ground_truth: Antoinette Sandbach