user: Question: What entrant had a chassis of Maserati 250F in 1954?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1953.0, 'Équipe Gordini', 'Gordini Type 16', 'Gordini Straight-6', 0.0]
SQL:

assistant: SELECT "Entrant" FROM "Table" WHERE "Chassis" = 'Maserati 250F' AND "Year" = 1954.0;