user: Question: Who constructed the car that Derek Warwick raced in with a TG181 chassis?
Columns: ['Constructor', 'Chassis', 'Engine', 'Tyres', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Williams - Ford', 'FW07C', 'Ford Cosworth DFV 3.0 V8', 'M G', 'Alan Jones', 'All']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Chassis" = 'TG181' AND "Driver" = 'Derek Warwick';