user: Question: Who is the winning driver when rd. is 3?
Columns: ['Rd.', 'Race', 'Pole position', 'Fastest lap', 'Most laps led', 'Winning driver', 'Winning team', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'St. Petersburg', 'Will Power', 'Hélio Castroneves', 'Dario Franchitti', 'Dario Franchitti', 'Chip Ganassi Racing', 'Report']
SQL:

assistant: SELECT "Winning driver" FROM "Table" WHERE "Rd." = '3';