user: Question: What is the Chassis from before 1997 with a Lamborghini V12 engine?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1990.0, 'BMS Scuderia Italia', 'Dallara F190', 'Cosworth V8', 0.0]
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Year" < 1997.0 AND "Engine" = 'Lamborghini V12';