user: Question: Can you tell me the Manufacturer that has the Rider of Stefan Bradl?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Simone Corsi', 'Aprilia', 23.0, '40:56.168', 1.0]
SQL:

assistant: SELECT "Manufacturer" FROM "Table" WHERE "Rider" = 'Stefan Bradl';