user: Question: who directed the episode that have 0.25 million u.s viewers
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [11.0, 1.0, '"The Key"', 'Nicole Holofcener', 'Mike White', 'January13,2013', '0.30']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "U.S. viewers (million)" = '0.25';