user: Question: How many different C_{high} values are there for the Good category?
Columns: ['C_{low}', 'C_{high}', 'I_{low}', 'I_{high}', 'Category']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['0', '12.0', 0.0, 50.0, 'Good']
SQL:

assistant: SELECT COUNT("C_{high}") FROM "Table" WHERE "Category" = 'Good';