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

Example input: Sentence: Jacob and Benny are squatting at the gym. Jacob has thin frail legs and Benny has big strong legs. Question: Who squats less weight?
Example output: Jacob
Example explanation: Typically, people with thin frail legs squat less weight than people with big strong legs, so the answer is Jacob.
Q: Sentence: Bob took his toy car outside to play with it. He rolled it on the street and then he rolled it in the grass. He noted that the toy car rolled much faster in the street. Question: Which surface caused more friction?
A:
The grass