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.

Sentence: Kory set up two slides in his backyard. One slide is metal and doesn't create much friction, while the other slide is wood and creates more friction. Question: If Kory slides down both slides, which one will he go quicker on? (A) metal slide (B) wood slide
metal slide

Sentence: Toby went ice skating during the winter and noticed that he hardly had to put any effort into moving forward when he switched from the sidewalk to the ice on the pond. Question: Which surface was smoother? (A) Sidewalk (B) Ice pond
Ice pond

Sentence: A traveler wants to go between cities in Japan. She does some research and sees that a bullet train can go much faster than a car. Question: If she wants to spend less time in her trip from city to city, which should she choose? (A) bullet train (B) car.

bullet train