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: Official retirement took place at Fort Knox , on 17 October 1992 . 
 Question: what   took something?
Student:
Official retirement