user: Question: What is the district that has a Republican?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Massachusetts 2', 'Edward Boland', 'Democratic', 1952.0, 'Re-elected', 'Edward Boland (D) Unopposed']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Party" = 'Republican';