user: Question: What is the name of the Chassis of Diver Maria Teresa de Filippis in round 1?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Maria Teresa de Filippis', 'Behra-Porsche - Porsche', 'RSK', 'Porsche 547/6 1.5 F4', 'Maria Teresa de Filippis', '1']
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Rounds" = '1' AND "Driver" = 'Maria Teresa de Filippis';