Q: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
Passage: For many years Labour held to a policy of not allowing residents of Northern Ireland to apply for membership, instead supporting the Social Democratic and Labour Party (SDLP) which informally takes the Labour whip in the House of Commons. The 2003 Labour Party Conference accepted legal advice that the party could not continue to prohibit residents of the province joining, and whilst the National Executive has established a regional constituency party it has not yet agreed to contest elections there. In December 2015 a meeting of the members of the Labour Party in Northern Ireland decided unanimously to contest the elections for the Northern Ireland Assembly held in May 2016.
A:
What party held a policy of always allowing people from Northern Ireland to apply for membership?