user: Question: What is the average Lane where Belarus is the nationality?
Columns: ['Heat', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [6.0, 4.0, "Susie O'Neill", 'Australia', '1:59.14']
SQL:

assistant: SELECT AVG("Lane") FROM "Table" WHERE "Nationality" = 'Belarus';