Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Name the IHSAA class with county 18 delaware and tigers mascot

### Inputs:
table_name: table, columns: ['School', 'Location', 'Mascot', 'Enrollment', 'IHSAA Class', 'IHSAA Football Class', '# / County']

### Response:
SELECT IHSAA Class FROM table WHERE # / County = 18 delaware AND Mascot = tigers