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.

[Q]: Sentence: The name `` SD-6 '' derives from the French , `` Section Disparu '' , which , in character Sydney Bristow 's words , means `` The Section that does n't exist . '' 
 Question: what does n't  exist?
[A]: The Section


[Q]: Sentence: In addition , even when they do match , escape mutants are often generated . 
 Question: what   escapes?
[A]: mutants


[Q]: Sentence: Then , built by the LNWR , the branch line to Ashbourne was opened in 1899 . 
 Question: who   built something?
[A]:
LNWR