You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Example Input: Sentence: A bird is much faster then a beetle. Question: If both animals make the same journey, which will arrive sooner?
Example Output: bird

Example Input: Sentence: Debbie was exercising with a giant exercise ball. It rolled out from under her and rolled on the frictionless gym floor. She retrieved it and started again, but this time it rolled onto a rough rubber mat. Question: Which surface was smoother?
Example Output: gym floor

Example Input: Sentence: Mike was comparing the mass of a boulder and a pebble. He found that the mass of the boulder was much greater then the mass of the pebble. Question: Which item emits weaker gravity?
Example Output:
pebble