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

### Instruction:
What is the smallest number of silvers associated with bronzes under 20, totals of 1, golds of 0, and in Water Polo?

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

### Response:
SELECT MIN Silver FROM table WHERE Bronze < 20 AND Total = 1 AND Sport = water polo AND Gold < 0