instruction:
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.
question:
Sentence: Following the report , Attorney General Michael Mukasey appointed a special prosecutor to investigate whether former Attorney General Alberto Gonzales and other officials involved in the firings of nine U.S. attorneys broke the law . 
 Question: who should  investigate something?
answer:
a special prosecutor


question:
Sentence: Getting there requires a fairly steep hike from the Rim Drive trailhead . 
 Question: what is  required?
answer:
a fairly steep hike from the Rim Drive trailhead ### a fairly steep hike


question:
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   constricts something?
answer:

the use of a miotic