TASK DEFINITION: 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.
PROBLEM: Sentence: `` Billboard '' ranked it as the No. 15 song for 1975 . 
 Question: what was  ranked?

SOLUTION: it

PROBLEM: Sentence: Having finished his apprenticeship with Hammond , Keats registered as a medical student at Guy 's Hospital and began studying there in October 1815 . 
 Question: what did someone register  as?

SOLUTION: a medical student

PROBLEM: Sentence: In 2007 , private corporations controlled 80 % of the cable television channels , 100 % of the newspaper companies , and 706 out of 709 radio stations . 
 Question: who   controlled something?

SOLUTION:
private corporations