user: Question: What is the average number of silvers for teams ranked 5 with 0 bronze?
Columns: ['Rank', 'Institution', 'Gold', 'Silver', 'Bronze']
Types: ['text', 'text', 'real', 'real', 'real']
Sample row: ['1', 'University of Texas at Austin', 7.0, 2.0, 1.0]
SQL:

assistant: SELECT AVG("Silver") FROM "Table" WHERE "Rank" = '5' AND "Bronze" < 0.0;