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.

Example Input: Sentence: A nonsurgical alternative involves the use of a miotic to constrict the pupil and prevent the lens from luxating into the anterior chamber . 
 Question: what   prevents something?
Example Output: A nonsurgical alternative

Example Input: Sentence: The psychological impact of this first transformation caused Beast to experience short-term amnesia and also made it difficult for him to control his animalistic instincts , which would cause him to slip into an uncontrollable berserker rage during combat . 
 Question: why did something experience something?
Example Output: The psychological impact of this first transformation

Example Input: Sentence: Although the area was known for its healthy waters at least since the late Middle Ages , the spa was officially founded in 1769 . 
 Question: what was  known  for something?
Example Output:
the area