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.

[EX Q]: Sentence: Tim has to push an ice sculpture across the ballroom in order to get his restaurant ready for a wedding. He notices that it is easier to push the sculpture when he moves it across the polished ballroom floor than when he moves it across the rough cobblestone floor. Question: If Tim is trying to keep the ice sculpture from melting, which surface should he push it across in order to produce less heat? (A) ballroom floor (B) cobblestone floor
[EX A]: ballroom floor

[EX Q]: Sentence: Frank was dragging a heavy log across the yard. His twin brother Fred was dragging one that weighed only half as much. Question: When the work was through, who had lost more perspiration? (A) Frank (B) Fred
[EX A]: Frank

[EX Q]: Sentence: Thrusting a throwing star into yogurt heats it up less then thrusting it into jelly. Question: Which surface allows the throwing star to reach a higher top speed as it is thrust into it? (A) jelly (B) yogurt
[EX A]:
yogurt