user: Question: Which class has a Qual position of 30?
Columns: ['Class', 'Team', 'Drivers', 'Laps', 'Qual Pos']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['OC', 'Castrol Perkins Racing', 'Larry Perkins Russell Ingall', 147.0, 7.0]
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Qual Pos" = 30.0;