Detailed Instructions: 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: Jim and Bob are running on the track.  Jim has a hurt knee and can't run as fast. Question: After a half hour, who has run further? (A) Jim (B) Bob
A:
Bob