user: Question: Who are all winning drivers if winning team is Carlin Motorsport and circuit is Croft?
Columns: ['Round', 'Circuit', 'Date', 'Pole Position', 'Fastest Lap', 'Winning driver', 'Winning team']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Brands Hatch', '1 April', 'James Courtney', 'James Courtney', 'Robbie Kerr', 'Alan Docking Racing']
SQL:

assistant: SELECT "Winning driver" FROM "Table" WHERE "Winning team" = 'Carlin Motorsport' AND "Circuit" = 'Croft';