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: A billiard ball has a greater mass then a basketball. Question: Which ball has a stronger field of gravity? (A) billiard ball (B) basketball
answer:
billiard ball


question:
Sentence: Millie bends two tree branches. One is dry and is not as flexible as the other, which is wet and more bendable. Question: Which is more likely to break when she bends it? (A) wet branch (B) dry branch
answer:
dry branch


question:
Sentence: Jim ran over a nail on his bicycle and got a flat tire. David ran over the same nail in his car and his tire didn't get flat. Question: Why did Jim get a flat tire but David did not? (A) Jim weights more than David (B) Jim's tire was thinner
answer:

Jim's tire was thinner