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: Ian rolls two balls down a sidewalk at the same time. One is red, the other is white. The white ball goes further than the red one. Question: Which ball went slower? (A) white ball (B) red ball
A: 
red ball