user: Question: Which nationality has a split in the 50m of 29.51?
Columns: ['Place', 'Lane', 'Name', 'Nationality', '50m Split', '100m Split', '150m Split', 'Time']
Types: ['real', 'real', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: [1.0, 4.0, 'Katie Hoff', 'USA', 28.35, '1:01.96', '1:39.06', '2:10.13']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "50m Split" = 29.51;