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 Input:
Sentence: A plunger gets a lot hotter plunging through a clogged toilet then plunging through a clean toilet. Question: Which surface will let the plunger go a greater distance per push? (A) clogged toilet (B) clean toilet

Ex Output:
clean toilet

Ex Input:
Sentence: Debbie was exercising with a giant exercise ball. It rolled out from under her and rolled on the frictionless gym floor. She retrieved it and started again, but this time it rolled onto a rough rubber mat. Question: Which surface was smoother? (A) gym floor (B) rubber mat

Ex Output:
gym floor

Ex Input:
Sentence: Roy is trying to figure out which type of hockey field will allow him to make the longest hockey slapshot with his hockey puck. The roller hockey field is rough and made of asphalt while the ice hockey field is smooth and made of ice. Question: Which field will let him make a longer slapshot? (A) roller hockey (B) ice hockey

Ex Output:
ice hockey