user: Question: What is the tyre when the entrant is SA Alfa Romeo and the driver is Luigi Fagioli?
Columns: ['Driver', 'Entrant', 'Constructor', 'Chassis', 'Engine', 'Tyre']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['José Froilán González', 'Scuderia Achille Varzi', 'Maserati', 'Maserati 4CLT-48', 'Maserati L4s', 'P']
SQL:

assistant: SELECT "Tyre" FROM "Table" WHERE "Entrant" = 'SA Alfa Romeo' AND "Driver" = 'Luigi Fagioli';