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

### Instruction:
What long-term gain for collectibles coincides with ordinary income rate 15%?

### Inputs:
table_name: table, columns: ['Ordinary income rate', 'Long-term capital gain rate', 'Short-term capital gain rate', 'Long-term gain on commercial buildings*', 'Long-term gain on collectibles']

### Response:
SELECT Long-term gain on collectibles FROM table WHERE Ordinary income rate = 15%