user: Question: Which Colliery has a Death toll of 7?
Columns: ['Colliery', 'Location', 'Date', 'Year', 'Death toll', 'cause']
Types: ['text', 'text', 'text', 'real', 'real', 'text']
Sample row: ['Dinas Colliery', 'Dinas', '1 January', 1844.0, 12.0, 'gas explosion']
SQL:

assistant: SELECT "Colliery" FROM "Table" WHERE "Death toll" = 7.0;