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.

Sentence: In weather terms, the boundary between two air masses is called front. Question: In weather terms, what do you call the boundary between two air masses?
front

Sentence: There are four many visual clues to indicate a chemical reaction. Question: There are how many visual clues to indicate a chemical reaction?
four

Sentence: Fermat's principle states that light will always take the path of the least amount of time. Question: Fermat's principle states that light will always take the path of least amount of?
time