Question: The Chief Secretary to the Treasury is also a member of what political party?

Context paragraphs:
United Kingdom general election, 2015 (Scotland): The 2015 United Kingdom general election in Scotland was held on 7 May 2015 and all 59 seats were contested under the First past the post electoral system.  Unlike the 2010 General Election, where no seats changed party, the Scottish National Party (SNP) managed to win all but three seats in Scotland in an unprecedented landslide gaining a total of fifty-six seats and also become the first party in sixty years to win 50% of the Scottish vote.  It saw the Labour Party suffer its worst ever election defeat within Scotland losing 40 of the 41 seats they were defending, including the seats of Scottish Labour Party leader Jim Murphy and also the then Shadow Foreign Secretary Douglas Alexander.  The Liberal Democrats lost ten of the eleven seats they were defending with the then Chief Secretary to the Treasury Danny Alexander and former leader Charles Kennedy also losing their seats.  The election also saw the worst performance by the Conservative Party which received its lowest share of the vote since its creation in 1965, although it retained the one seat that it previously held.  In all, 50 of the 59 seats changed party, 49 of them being won by first-time MPs.

Financial Secretary to the Treasury: Financial Secretary to the Treasury is a junior Ministerial post in the British Treasury.  It is the 4th most significant Ministerial role within the Treasury after the Chancellor of the Exchequer, the Chief Secretary to the Treasury, and the Paymaster General.  It is almost never a Cabinet office.

Exchequer Secretary to the Treasury: The Exchequer Secretary to the Treasury is a junior ministerial post in the British Treasury, ranked below the Chancellor of the Exchequer, the Chief Secretary to the Treasury, the Paymaster General and the Financial Secretary to the Treasury, and alongside the Economic Secretary to the Treasury.  It ranks at Parliamentary Secretary level and is not a Cabinet office.  Unlike the other posts of Secretary to the Treasury, it is only used occasionally, normally when the post of Paymaster General is allocated to a Minister outside the Treasury.

Chief Secretary for Ireland: The Chief Secretary for Ireland was a key political office in the British administration in Ireland.  Nominally subordinate to the Lord Lieutenant, and officially the "Chief Secretary to the Lord Lieutenant", from the early 19th century until the end of British rule he was effectively the government minister with responsibility for governing Ireland; usually it was the Chief Secretary, rather than the Lord Lieutenant, who sat in the British Cabinet.  The Chief Secretary was "ex officio" President of the Local Government Board for Ireland from its creation in 1872.

David Gauke: David Michael Gauke ( ; born 8 October 1971) is a British Conservative Party politician and a solicitor.  He has been the MP for South West Hertfordshire since 2005 and is the current Secretary of State for Work and Pensions.

Government Digital Service: The Government Digital Service is a unit of the Her Majesty's Government's Cabinet Office tasked with transforming the provision of government digital services.  It was formed in April 2011 to implement the 'Digital by Default' strategy proposed by a report produced for the Cabinet Office in 2010 called 'Directgov 2010 and beyond: revolution not evolution'.  It is overseen by the Public Expenditure Executive (Efficiency & Reform) which is co-chaired by Minister for the Cabinet Office, Ben Gummer and the Chief Secretary to the Treasury, David Gauke.  GDS is primarily based in the Whitechapel Building, London.  Its Director General is Kevin Cunnington.

Economic Secretary to the Treasury: The Economic Secretary to the Treasury is the fifth-most senior ministerial post in the UK Treasury, after the Chancellor of the Exchequer, the Chief Secretary to the Treasury, the paymaster-general and the financial secretary.  It is not a cabinet-level post.

Secretary to the Treasury: In the United Kingdom, there are several Secretaries to the Treasury, who are Treasury ministers nominally acting as secretaries to HM Treasury.  The origins of the office are unclear, although it probably originated during Lord Burghley's tenure as Lord Treasurer in the 16th century.  The number of secretaries was expanded to two by 1714 at the latest.  The Treasury ministers together discharge all the former functions of the Lord Treasurer, which are nowadays nominally vested in the Lords Commissioners of the Treasury.  Of the Commissioners, only the Second Lord of the Treasury, who is also the Chancellor of the Exchequer, is a Treasury minister (the others are the Prime Minister and the Government Whips).  The Chancellor is the senior Treasury minister, followed by the Chief Secretary to the Treasury, who also attends Cabinet and has particular responsibilities for public expenditure.  In order of seniority, the junior Treasury ministers are: the Financial Secretary to the Treasury; the Economic Secretary to the Treasury; the Exchequer Secretary to the Treasury; and the Commercial Secretary to the Treasury (Office currently not in use).  One of the present-day secretaries, the Parliamentary Secretary to the Treasury, formerly known as the 'Patronage Secretary', is not a Treasury minister but the Government Chief Whip in the House of Commons.  The office can be seen as a sinecure, allowing the Chief Whip to draw a government salary, attend Cabinet, and use a Downing Street residence.

Paymaster General: Her Majesty's Paymaster General or HM Paymaster General is a ministerial position in the United Kingdom.  When the post is held by a minister in HM Treasury it is typically given to the third highest-ranking minister, after the Chancellor of the Exchequer and the Chief Secretary to the Treasury.  The incumbent Paymaster General is Mel Stride, whose main title is Financial Secretary to the Treasury.

Shadow Chief Secretary to the Treasury: The Shadow Chief Secretary to the Treasury is a member of the Shadow Cabinet, and is the deputy to the Shadow Chancellor.  The Shadow Chief Secretary to the Treasury acts as the primary opposition to the equivalent Governmental position, the Chief Secretary to the Treasury, who is deputy to the Chancellor of the Exchequer.  Currently the position of Shadow Chief Secretary to the Treasury is held by Peter Dowd of the Labour Party.

Supporting paragraphs: Government Digital Service David Gauke
Answer: British Conservative Party