user: Question: What is the transfer window for BEL?
Columns: ['Name', 'Country', 'Status', 'Moving to', 'Transfer window', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Habarugira', 'BEL BDI', 'Loaned out', 'Union', 'Summer', 'n/a']
SQL:

assistant: SELECT "Transfer window" FROM "Table" WHERE "Country" = 'BEL';