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: A spring rolling along a bed experiences very low friction, while one rolling along the floor experiences high friction. Question: Which surface is less rough? (A) floor (B) bed
A:
bed