user: Question: Who was the incumbent in the Illinois 17 district?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Illinois 3', 'Fred E. Busbey', 'Republican', 1946.0, 'Lost re-election Democratic gain', 'Neil J. Linehan (D) 52.9% Fred E. Busbey (R) 47.1%']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "District" = 'Illinois 17';