user: Question: What model engine has a Lotus 16 chassis?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1956.0, 'Bruce Halford', 'Maserati 250F', 'Maserati Straight-6', 0.0]
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Chassis" = 'Lotus 16';