In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Example Input: Sentence: Electrophiles have a strong tendency to react with nucleophiles. Question: Electrophiles have a strong tendency to react with what?
Example Output: nucleophiles

Example Input: Sentence: Motion can be defined simply as a change in position. Question: What can be defined simply, as a change in position?
Example Output: motion

Example Input: Sentence: The logistics of carrying out cellular metabolism sets limits on the size of the cell. Question: The logistics of carrying out cellular metabolism sets limits on what physical property of the cell?
Example Output:
size