TASK DEFINITION: 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.
PROBLEM: Sentence: Mark has offered to tow his friends truck which has broken down. It is very heavy, which is causing delay in speeding up. Question: This truck must be which? (A) Pickup Truck (B) King Cab Truck

SOLUTION: King Cab Truck

PROBLEM: Sentence: Two bunnies, a white one and a black one, are hopping along together. The black bunny goes further than the white one. Question: Which bunny is faster? (A) white bunny (B) black bunny

SOLUTION: black bunny

PROBLEM: Sentence: A dirty tooth isn't as smooth as a clean tooth. Question: Which surface will a toothbrush move over at a greater rate of speed? (A) dirty tooth (B) clean tooth

SOLUTION:
clean tooth