user: Question: What engine was made in 1991?
Columns: ['Year', 'Chassis', 'Engine(s)', 'Tyres', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1987.0, 'Lola LC87', 'Ford DFZ V8', 'G', 3.0]
SQL:

assistant: SELECT "Engine(s)" FROM "Table" WHERE "Year" = 1991.0;