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

Ex Input:
Sentence: A boy slid in the mud, after walking across the grass yard with no problem. Question: Which had more resistance?

Ex Output:
grass


Ex Input:
Sentence: Lisa is riding her bike while Peter is walking the same way. Question: After 30 minutes who would have gone the furthest?

Ex Output:
Lisa


Ex Input:
Sentence: A boomerang thrown into a windy sky heats up quite a bit, but one thrown into a calm sky stays about the same temperature. Question: Which surface puts the least amount of friction on the boomerang?

Ex Output:

calm sky