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

Ex Input:
Sentence: A knob rolled across a wooden table travels at a lower rate of speed then one rolled across a metal table. Question: Which surface provides more friction to the knob?

Ex Output:
wooden table

Ex Input:
Sentence: A tree trunk is thicker then a tree leaf. Question: Which part of the tree is the stronger one?

Ex Output:
trunk

Ex Input:
Sentence: Tom and Steve are riding their bikes to the beach. Tom starts riding his bike earlier. Question: Who rode their bike further?

Ex Output:
Tom