user: Question: How many silver medals does Cuba have?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Japan', 4.0, 3.0, 4.0, 11.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Nation" = 'Cuba';