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

### Instruction:
I want the average bronze for total of 19 and silver of 8 with rank of 31

### Inputs:
table_name: table, columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']

### Response:
SELECT AVG Bronze FROM table WHERE Total = 19 AND Silver = 8 AND Rank = 31