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.

[Q]: Sentence: Diana and Dave are aboard the same train after getting on at the same station. Question: If Diana gets out of the train one stop before Dave, who traveled a shorter distance? (A) Diana (B) Dave.
[A]: Diana


[Q]: Sentence: A sailboat and a speedboat were crossing the lake. Question: Which one made it across first? (A) the sailboat (B) the speedboat
[A]: the speedboat


[Q]: 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
[A]:
clean tooth