instruction:
You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the **incorrect** answer (return the string of the incorrect option, not A/B).
question:
Sentence: Ada was playing kickball. She kicked a ball into the gravel and noticed it was warm when she picked it up. She kicked it again onto a grassy hill, but this time the ball wasn't very hot when she retrieved it. Question: In which surface did the ball travel the most? (A) gravel (B) grassy hill
answer:
gravel

question:
Sentence: Bob was cleaning with a scrub brush. He cleaned both tile and carpet. He noted that the carpet caused more friction. Question: Which surface would cause the scrub brush to scrub with less speed? (A) The carpet (B) The tile
answer:
The tile

question:
Sentence: A brown mouse and a black mouse each run through 50 foot tunnels as quickly as they can. The black mouse made it to the other end in a shorter amount of time than the brown mouse. Question: Which mouse couldn't run as fast? (A) the brown mouse (B) the black mouse
answer:
the black mouse