user: Question: How many different engines are there for the model with model designation 97G00?
Columns: ['Model Type', 'Model Designation', 'Engine', 'Wheelbase (mm/inch)', 'GVW (kg/ton)', 'Axle Ratio']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['18 cwt.', '97100', '1759 cc (107.5 cu. in.) gasoline', '2692/106', '2235/2.2', '8/37']
SQL:

assistant: SELECT COUNT("Engine") FROM "Table" WHERE "Model Designation" = '97G00';