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

Example Input: Sentence: Asteroids can be huge. But not as big as the sun. Question: Which has a weaker gravity?
Example Output: Asteroid

Example Input: Sentence: Tom accidentally knocks a clay pot and a metal pot off of a shelf. Question: Which pot is less likely to break?
Example Output: Metal pot

Example Input: Sentence: A leaf skidding onto a dirty porch gets a lot hotter then one skidding onto a clean porch. Question: Which surface will allow the leaf to skid at a higher rate of speed?
Example Output:
clean porch