The 1986 South Antrim by-election included a candidate from which Northern Irish unionist party?
South Antrim by-election, 1986: The 1986 South Antrim 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). South Antrim by-election, 1986:  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. Democratic Unionist Party: The Democratic Unionist Party is a unionist political party in Northern Ireland.
Democratic Unionist Party