user: Question: What is Team, when Replaced By is "Omar Arellano"?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment', 'Position in table']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Atlas', 'Darío Franco', 'Resigned', 'Jan. 26, 2009', 'Ricardo La Volpe', 'Jan. 28, 2009', '17th']
SQL:

assistant: SELECT "Team" FROM "Table" WHERE "Replaced by" = 'Omar Arellano';