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.

Ex Input:
Sentence: Mutation is essential in order for evolution to occur because it increases genetic variation and the potential for individuals to differ. Question: What phenomenon is essential in order for evolution to occur because it increases genetic variation and the potential for individuals to differ?

Ex Output:
mutation


Ex Input:
Sentence: Boron only occurs naturally in compounds with oxygen element. Question: Boron only occurs naturally in compounds with what element?

Ex Output:
oxygen


Ex Input:
Sentence: The electrochemical potential across a membrane determines the tendency of an ion to do cross the membrane. Question: The electrochemical potential across a membrane determines the tendency of an ion to do what?

Ex Output:

cross the membrane