user: Question: Who was the winning constructor at the circuit of Parioli?
Columns: ['Name', 'Circuit', 'Date', 'Winning driver', 'Winning constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Tripoli Grand Prix', 'Tripoli', '6 March', 'Emilio Materassi', 'Bugatti', 'Report']
SQL:

assistant: SELECT "Winning constructor" FROM "Table" WHERE "Circuit" = 'Parioli';