user: Question: Who is the Constructor for round 5?
Columns: ['Team', 'Constructor', 'Motorcycle', 'Rider', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ducati Xerox', 'Ducati', 'Ducati 999F05', 'James Toseland', 'All']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Rounds" = '5';