question: What is unique about the Bronx 's location ?
answer: Of the five boroughs , the Bronx is the only one on the U.S. mainland
turker_answer: Unique about the Bronx 's location is of the five boroughs , the Bronx is the only one on the U.S. mainland .
rule-based: Unique about the Bronx 's location is of the five boroughs , the Bronx is the only one on the U.S. mainland .