user: Question: Who directed the episode whose production code is 2M5901?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production', 'U.S. viewers (in millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [26.0, 1.0, '"What Doesn\'t Kill You"', 'Michael Katleman', 'Janet Tamaro', 'June5,2012', '2M5901', '5.62']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Production" = '2M5901';