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.

Example Input: Sentence: In a traditional ceremony , Command Sgt. Major Richard L. Ross , holding the division color with battle streamers , passed it to General Frederick M. Franks , Jr. , completing the official retirement of the division , and the 3rd Armored Division was removed from the official force structure of the U.S. Army . 
 Question: what was  completed?
Example Output: the official retirement of the division

Example Input: Sentence: After his parents separated because of his father 's long trips , the younger La Flesche lived with his mother and her family among the Omaha . 
 Question: who were  separated?
Example Output: his parents

Example Input: Sentence: The `` power cepstrum '' was defined in a 1963 paper by Bogert et al. . 
 Question: what was  defined?
Example Output:
power cepstrum