user: ### NOW ANSWER:
Question: Which Bronze has a Silver of 15, and a Total smaller than 54?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Russia', 86.0, 57.0, 31.0, 174.0]
SQL:

assistant: SELECT MIN("Bronze") FROM "Table" WHERE "Silver" = 15.0 AND "Total" < 54.0;