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

Sentence: The pot roast should be put on first and the biscuits last in order to make sure they are both ready to serve at the same time. Question: Which food items takes a while to cook?
pot roast

Sentence: Elias has just made two paper airplane. One is consistently faster in the air. Question: This is probably made of which?
Printer Paper

Sentence: A frisbee benefits from low friction when sliding across a frozen lake and high friction when sliding over frozen ground. Question: Which surface is going to make the frisbee slide at a lower rate of speed?

frozen ground