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 boy slid in the mud, after walking across the grass yard with no problem. Question: Which had more resistance? (A) mud (B) grass
Output:
grass