Definition: 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.
Input: Sentence: Billy and Cody are walking together.  Cody gets tired and sits on a park bench. Question: When they leave the park together, who has walked farther? (A) Cody (B) Billy
Output:
Billy