user: Question: What is the capital of the country with a population density per km² of 15.6/km² (/sqmi)?
Columns: ['Country or territory with flag', 'Area (km²) (per sqmi)', 'Population (July 2009 est.)', 'Population density per km²', 'Capital']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Argentina', 'km2 (sqmi)', 40482000.0, '14.3/km² (/sqmi)', 'Buenos Aires']
SQL:

assistant: SELECT "Capital" FROM "Table" WHERE "Population density per km²" = '15.6/km² (/sqmi)';