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.
Input: Sentence: A little boy rolls two of his rubber balls down the hallway. The red ball stops before the blue one does. Question: Which one rolled the furthest? (A) Red ball (B) blue ball.
Output:
blue ball