user: Question: what is the district where the vacator is Vacant?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Georgia 9th', 'Vacant', 'Rep-elect Garnett McMillan died before taking seat', 'Benjamin H. Hill (D)', 'May 5, 1875']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Vacator" = 'Vacant';