You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct option for the given question. Write down the answer index: 'A' or 'B'.

[EX 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
[EX A]: B

[EX Q]: Sentence: Matt knows that the air indoors is calmer then the air outdoors. Question: Which area will he be forced to throw his frisbee slower in? (A) indoors (B) outdoors
[EX A]: B

[EX Q]: Sentence: Andy was standing in a field at night and he saw two street lights in the distance, one to his left and and one to his right. The one on the left wasn't as bright as the one on the right. Question: Which one was he closer to? (A) the one on the left (B) the one on the right
[EX A]:
B