user: Question: Which candidates were in the election where Frank W. Boykin was an incumbent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Alabama 1', 'Frank W. Boykin', 'Democratic', 1935.0, 'Re-elected', '√ Frank W. Boykin (D) Unopposed']
SQL:

assistant: SELECT "Candidates" FROM "Table" WHERE "Incumbent" = 'Frank W. Boykin';