user: Question: What is the highest round for UFC 109?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Win', '13–10 (1)', 'Jared Downing', 'Submission (inverted heel hook)', 'Bellator 104', 1.0, 'Cedar Rapids, Iowa , United States']
SQL:

assistant: SELECT MAX("Round") FROM "Table" WHERE "Event" = 'UFC 109';