user: Question: Who is the driver whose Constructor was ERA, and whose entrant was T.A.S.O. Mathieson?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Alfa Romeo SpA', 'Alfa Romeo', '158/50', 'Juan Manuel Fangio', '1–2, 4–7']
SQL:

assistant: SELECT "Driver" FROM "Table" WHERE "Constructor" = 'ERA' AND "Entrant" = 'T.A.S.O. Mathieson';