user: Question: Which Chassis has 4 points?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2006.0, 'WilliamsF1 Team', 'Williams FW28', 'Cosworth CA2006 2.4 V8', '4']
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Points" = '4';