user: Question: What is Country, when Builder is "Sheerness Dockyard"?
Columns: ['Country', 'Builder', 'Location', 'Ship', 'Class / type']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United Kingdom', 'Samuda Brothers', 'Poplar, London', 'Orion', 'Belleisle-class ironclad']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Builder" = 'Sheerness Dockyard';