user: Question: What is the sum of the bronze medals won by South Korea?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Russia', 9.0, 4.0, 2.0, 15.0]
SQL:

assistant: SELECT SUM("Bronze") FROM "Table" WHERE "Nation" = 'South Korea';