user: Question: Who is the driver of the chassis-engine Porsche 956 GTi?
Columns: ['Class', 'Team', 'Driver', 'Chassis – Engine', 'Laps']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['C1', 'Blaupunkt Joest Racing', 'Klaus Ludwig', 'Porsche 956 B', 79.0]
SQL:

assistant: SELECT "Driver" FROM "Table" WHERE "Chassis – Engine" = 'Porsche 956 GTi';