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

[EX Q]: Sentence: Franklin found that if he slides a turtle on its back across a pool table, it slides farther than if he were to slide the turtle across a pile of leaves. He realizes this because there is less resistance on the pool table. Question: The difference in the length that the turtle slides across both surfaces can be attributed to which surface being rougher?
[EX A]: pile of leaves

[EX Q]: Sentence: Rolling a red ball across an orange carpet makes the ball get hotter then rolling it across a blue carpet. Question: Which carpet is the most smooth?
[EX A]: blue carpet

[EX Q]: Sentence: Doug is bored with studying, so he begins manipulating some writing utensils on his desk. He sees that the plastic pen is bendier than the wooden pencil. Question: This means that which utensil is less likely to snap as he bends it?
[EX A]:
plastic pen