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.

Sentence: A substantially revised version of `` Champagne Charlie '' was recorded in 1932 by the American blues singer Blind Blake . 
 Question: what was  recorded?
A substantially revised version of `` Champagne Charlie ''

Sentence: An `` optical image stabilizer '' , often abbreviated OIS , IS , or OS , is a mechanism used in a still camera or video camera that stabilizes the recorded image by varying the optical path to the sensor . 
 Question: what is  recorded?
image

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?

A nonsurgical alternative