user: Question: How many drivers did Bob Gerard Racing have?
Columns: ['No', 'Driver', 'Entrant', 'Constructor', 'Chassis', 'Engine']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'B. Bira', 'Private', 'Maserati', 'Maserati 4CLT/48', 'Maserati L4s']
SQL:

assistant: SELECT COUNT("Driver") FROM "Table" WHERE "Entrant" = 'Bob Gerard Racing';