In this task, you are given a sentence and question which can be answered using the sentence. Your task is to answer the question using the information from the sentence. The answer to the question is unique and it is a continuous text span from the sentence.

[EX Q]: Sentence: Debate surrounding a volkstaat returned to the mainstream media following the murder of AWB leader Eugene Terre'Blanche in April 2010 . 
 Question: what   surrounds something?
[EX A]: Debate

[EX Q]: Sentence: Instead , much of numerical analysis is concerned with obtaining approximate solutions while maintaining reasonable bounds on errors . 
 Question: what might something maintain?
[EX A]: reasonable bounds on errors

[EX Q]: Sentence: These so-called model villages were envisioned as a self-contained community for the factory workers . 
 Question: what were something envisioned  as?
[EX A]:
a self-contained community for the factory workers