user: Question: What country has a Silver medal in the Boxing, Heavyweight event?
Columns: ['Olympics', 'Name', 'Country', 'Medal', 'Event']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1912 Summer Olympics', 'Jim Thorpe', 'United States', 'Gold', 'Athletics, Pentathlon']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Medal" = 'Silver' AND "Event" = 'Boxing, Heavyweight';