CREATE TABLE table_57164 ("Entrant" TEXT, "Constructor" TEXT, "Chassis" TEXT, "Driver" TEXT, "Rounds" TEXT)

Who is the driver whose Constructor was Era, and whose entrant was T.A.S.O. Mathieson?
SELECT "Driver" FROM table_57164 WHERE "Constructor" = 'era' AND "Entrant" = 't.a.s.o. mathieson'
SELECT "Driver" FROM "table_57164" WHERE "Constructor" = 'era' AND "Entrant" = 't.a.s.o. mathieson'