You are given a sentence and a question. You're expected to write the correct answer based on the sentence.
--------
Question: Sentence: Asteroids can be huge. But not as big as the sun. Question: Which has a weaker gravity?

Answer: Asteroid


Question: Sentence: There were two dogs barking on my block: my dog who was next to me and the dog farther down the street. Question: Which dog sounded quieter to me?

Answer: my neighbor's dog


Question: Sentence: Tony and Alex are riding motorcycles across the country.  Tony rides until early afternoon, but Alex rides until nightfall. Question: Who rode farther?

Answer:
Alex