user: Question: What is the average number of bronze medals won by Poland?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'East Germany', 12.0, 12.0, 10.0, 34.0]
SQL:

assistant: SELECT AVG("Bronze") FROM "Table" WHERE "Nation" = 'Poland';