Question: Which Irish Unionist politician was elected unopposed as Member of parliament for South Tyrone in 1916 as part of the Ulster Unionist Party?
Context: Thomas Robert Lavery (1852–1938) was an Irish Unionist (and later Northern Irish Unionist) politician.  He worked as a director of a hemstitching company before his election as an Ulster Unionist Party member of Down County Council. The 1951 Londonderry by-election was held on 19 May 1951 when the incumbent Ulster Unionist Party MP, |Ronald Deane Ross was appointed as the Northern Ireland Government Agent in London.  The Ulster Unionist candidate William Wellwood was elected unopposed.  He retained the seat unopposed at the United Kingdom general election, 1951. John McCallister (born 20 February 1972) is a Northern Irish Unionist politician.  In 2007, was elected to the Northern Ireland Assembly as an Ulster Unionist Party (UUP) member for South Down.  On 14 February 2013, McCallister announced that he had resigned from the UUP due to its decision to engage in an electoral pact with the Democratic Unionist Party.  He was a co-founder of the NI21 party with fellow ex-UUP member Basil McCrea but resigned the following year following disputes with McCrea.  He re-contested his seat as an Independent at the 2016 election but lost his seat, receiving just 2.8% of the vote. Edward Henry Carson, Baron Carson, PC, PC (Ire), KC (9 February 1854 – 22 October 1935), from 1900 to 1921 known as Sir Edward Carson, was an Irish unionist politician, barrister and judge.  From Dublin, he became the leader of the Irish Unionist Alliance and Ulster Unionist Party between 1910 and 1921, held numerous positions in the Cabinet of the United Kingdom and served as a Lord of Appeal in Ordinary.  He was one of the few people not a monarch to receive a British state funeral.  Historian John Brown says that "His larger than life-size statue, erected in his own lifetime in front of the Northern Ireland parliament at Stormont, symbolizes the widely held perception that Northern Ireland is Carson's creation." The 1986 Fermanagh and South Tyrone by-election was one of the fifteen 1986 Northern Ireland by-elections held on 23 January 1986, to fill vacancies in the Parliament of the United Kingdom caused by the resignation in December 1985 of all sitting Unionist Members of Parliament (MPs).  The MPs, from the Ulster Unionist Party, Democratic Unionist Party and Ulster Popular Unionist Party, did this to highlight their opposition to the Anglo-Irish Agreement.  Each of their parties agreed not to contest seats previously held by the others, and each outgoing MP stood for re-election. Reverend William Martin Smyth (born 15 June 1931) is a Northern Irish unionist politician, and was Ulster Unionist Party Member of Parliament for Belfast South from 1982 to 2005.  He was a Vice-President of the Conservative Monday Club. The South Tyrone by-election of 1916 was held on 28 February 1916.  The by-election was held due to the death of the incumbent Irish Unionist MP, Andrew Long Horner.  It was won by the Irish Unionist candidate William Coote, who was unopposed. The Ulster Unionist Party (UUP) is a unionist political party in Northern Ireland.  Having gathered support in Northern Ireland during the late-nineteenth and early-twentieth centuries, the party governed Northern Ireland between 1921 and 1972.  It was supported by most unionist voters throughout the conflict known as the Troubles, during which time it was often referred to as the Official Unionist Party (OUP).  Between 1905-1972 its MPs took the Conservative whip at Westminster. William Coote (1863 – 14 December 1924) was an Irish Unionist politician.  He was elected unopposed as Member of parliament for South Tyrone at the February 1916 by-election caused by the death of the incumbent Andrew Long Horner.  He was re-elected at the 1918 general election and served until the constituency was abolished in 1922. This is a list of Ulster Unionist Party MPs.  It includes all Members of Parliament elected to the British House of Commons representing the Ulster Unionist Party or its forerunner, the Irish Unionist Party, since 1918.  Members of the European Parliament, the Northern Ireland House of Commons or the Northern Ireland Assembly are not listed.
Answer: William Coote