CREATE TABLE table_name_86 (entrant VARCHAR, driver VARCHAR, chassis VARCHAR, constructor VARCHAR, tyre VARCHAR)

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?
SELECT entrant FROM table_name_86 WHERE constructor = "maserati" AND tyre = "p" AND chassis = "250f a6gcm" AND driver = "luigi villoresi"
SELECT "entrant" FROM "table_name_86" WHERE "250f a6gcm" = "chassis" AND "constructor" = "maserati" AND "driver" = "luigi villoresi" AND "p" = "tyre"