user: Question: who directed the episode that Elaine Ko wrote?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [25.0, 1.0, '" The Old Wagon "', 'Michael Spiller', 'Bill Wrubel', 'September22,2010', '2ARG05', '12.67']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Written by" = 'Elaine Ko';