user: Question: Which country is the Nnamdi Azikiwe International Airport in?
Columns: ['Country', 'Airport', 'City', '2010', 'Change (10/09)']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['South Africa', 'OR Tambo International Airport', 'Johannesburg', 18383549.0, '0 11.4%']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Airport" = 'Nnamdi Azikiwe International Airport';