user: Question: Who is entered earlier than 1975 and has a Lotus 20 chassis?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1965.0, 'Ecurie Tomahawk', 'Lotus 20', 'Ford Straight-4', 0.0]
SQL:

assistant: SELECT "Entrant" FROM "Table" WHERE "Year" < 1975.0 AND "Chassis" = 'Lotus 20';