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

### Instruction:
what is the type when the regulatory citation is 40 cfr 50.9(a)?

### Inputs:
table_name: table, columns: ['Pollutant', 'Type', 'Standard', 'Averaging Time', 'Regulatory Citation']

### Response:
SELECT Type FROM table WHERE Regulatory Citation = 40 cfr 50.9(a)