instruction:
You are given a sentence and a question. You're expected to write the correct answer based on the sentence.
question:
Sentence: Milo knows that a frozen lake is smoother than a grass field. This means that when he slides his paper plane across one of the two surfaces it will experience less friction. Question: Which surface is that?
answer:
frozen lake


question:
Sentence: Sliding a stake across the carpet results in less friction then sliding it across the drapes. Question: Which surface will force the stake to travel slower?
answer:
drapes


question:
Sentence: Little Bobby is in the woods breaking tree branches for fire wood. Question: Which branch can he break easier?
answer:

Thin branch