user: ### NOW ANSWER:
Question: Which engine from 1973 has a Brabham BT37 chassis?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1972.0, 'Motor Racing Developments', 'Brabham BT33', 'Ford Cosworth DFV V8', 0.0]
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Year" = 1973.0 AND "Chassis" = 'Brabham BT37';