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: 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?
Example Output: front

Example Input: Sentence: Of course, a net external force is needed to cause any acceleration, just as newton proposed in his second law of motion. Question: Of course, a net external force is needed to cause any acceleration, just as newton proposed in his second law of what?
Example Output: motion

Example Input: Sentence: A(n) carnivore is at the top of the energy pyramid. Question: What organism is at the top of the energy pyramid?
Example Output:
carnivore