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: 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: Bases are antacids comprised of. Question: What are antacids comprised of?
Example Output: bases

Example Input: Sentence: Humans have 23 pairs pairs of chromosomes. Question: How many pairs of chromosomes do human have ?
Example Output:
23 pairs