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: Density describes how much matter is in a certain amount of space. Question: What describes how much matter is in a certain amount of space?

Ex Output:
density


Ex Input:
Sentence: During the anaphase phase, sister chromatids separate and the centromeres divide. Question: During which phase do sister chromatids separate and the centromeres divide?

Ex Output:
anaphase


Ex Input:
Sentence: Mars is the fourth planet from the sun. Question: Which is the fourth planet from the sun?

Ex Output:

mars