user: Question: What Chassis code has a 200D model and a Power of PS (kW; hp) @ 4200?
Columns: ['Chassis code', 'Years', 'Model', 'Engine', 'Power', 'Torque']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['W123.020', '1976–1981', '200', '2.0L M115 I4', 'PS (kW; hp) @ 4800', 'N·m (lb·ft) @ 3000']
SQL:

assistant: SELECT "Chassis code" FROM "Table" WHERE "Power" = 'PS (kW; hp) @ 4200' AND "Model" = '200D';