question: What caused the size of Washington , D.C. to change ?
answer: Virginia reclaimed the portion of the District south of the Potomac
turker_answer: Virginia reclaiming the portion of the District south of the Potomac caused the size of Washington , D.C. to change .
rule-based: Virginia reclaimed the portion of the District south of the Potomac caused the size of Washington , D.C. to change .