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

### Instruction:
In what county is the school of Merrillville?

### Inputs:
table_name: table, columns: ['School', 'Location', 'Mascot', 'County', 'Enrollment 08-09', 'IHSAA Class', 'IHSAA Class Football', 'Year Joined', 'Previous Conference']

### Response:
SELECT County FROM table WHERE School = merrillville