user: Question: Who constructed Rolf Stommelen's car?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Jacky Ickx', 'Ferrari', 65.0, '1:53:28.3', 3.0]
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Driver" = 'Rolf Stommelen';