user: Question: In heat 4, what is Byun Hye-Young's Nationality?
Columns: ['Heat', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [5.0, 4.0, 'Megan Quann', 'United States', '1:07.48']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Heat" = 4.0 AND "Name" = 'Byun Hye-Young';