user: Question: Name the rank on channel for January 21, 2011
Columns: ['Episode number (Production number)', 'Title', 'Original air date', 'Total viewers on FX', 'Total viewers on FX+', 'Total viewers', 'Rank on channel']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['25 (3.01)', 'Bad Blood', 'January 14, 2011', '524,000', '94,000', '618,000', '#1 (FX) #1 (FX+)']
SQL:

assistant: SELECT "Rank on channel" FROM "Table" WHERE "Original air date" = 'January 21, 2011';