Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence: A zebra is forced to run at a slow pace in a zoo, but can run at a fast pace in a field. Question: Which surface has less resistance? (A) field (B) zoo
Student:
field