user: Question: what is the silver for Mexico?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'South Korea', 8.0, 0.0, 4.0, 12.0]
SQL:

assistant: SELECT "Silver" FROM "Table" WHERE "Nation" = 'Mexico';