Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence: While Ballard recuperates in the hospital , the released spirits , unharmed from the nuclear explosion , attack the city . 
 Question: who   attacked something?
Student:
the released spirits