user: Question: Tell me the category of NA director
Columns: ['Year', 'Director', 'Project', 'Category', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1979.0, 'Terrence Malick', 'Days of Heaven', 'Best Original Score', 'Nominated']
SQL:

assistant: SELECT "Category" FROM "Table" WHERE "Director" = 'NA';