instruction:
You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct answer (return the string of the correct option, not 'A' or 'B') for the given question.
question:
Sentence: Dave notice that when taking batting practice the baseball moves slower on the natural grass of the team's practice field than on the artificial grass of the stadium. Question: Which surface has more resistance? (A) the artificial grass or (B) the natural grass
answer:
the natural grass


question:
Sentence: A dirty tooth isn't as smooth as a clean tooth. Question: Which surface will a toothbrush move over at a greater rate of speed? (A) dirty tooth (B) clean tooth
answer:
clean tooth


question:
Sentence: Mary needs to put a piece of plywood between her bed frame and her mattress.  Her 2 children like to jump on the bed in the morning. Question: Which piece of plywood would be more likely to break when jumped on? (A) the 1/2 plywood slab or (B) the 1 plywood slab?
answer:
the 1/2 plywood slab