Can you say what was the entrant of maserati built item with a Tyre of p with a chassis of 250f a6gcm that was driven by Luigi Villoresi?
CREATE TABLE "teams_and_drivers" (
  "entrant" text,
  "constructor" text,
  "chassis" text,
  "tyre" text,
  "driver" text,
  "rounds" text
);
SELECT "entrant" FROM "teams_and_drivers" WHERE "constructor"='maserati' AND "tyre"='p' AND "chassis"='250f a6gcm' AND "driver"='luigi villoresi';