What entrant had a chassis of Maserati 250f in 1954?
CREATE TABLE table_14939 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)
SELECT "Entrant" FROM table_14939 WHERE "Chassis" = 'maserati 250f' AND "Year" = '1954'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What entrant had a chassis of Maserati 250f in 1954? ### Input: CREATE TABLE table_14939 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
) ### Response: SELECT "Entrant" FROM table_14939 WHERE "Chassis" = 'maserati 250f' AND "Year" = '1954'