CREATE TABLE table_52403 ("Entrant" TEXT, "Constructor" TEXT, "Chassis" TEXT, "Engine" TEXT, "Tyre" TEXT, "Driver" TEXT, "Rounds" TEXT)

What was the entrant in round 16 were Ferrari was the constructor?
SELECT "Entrant" FROM table_52403 WHERE "Rounds" = '16' AND "Constructor" = 'ferrari'
SELECT "Entrant" FROM "table_52403" WHERE "Constructor" = 'ferrari' AND "Rounds" = '16'