user: Question: How many rounds had a time of 5:00 at ufc 155?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Win', '13–1', 'Junior dos Santos', 'TKO (slam and punch)', 'UFC 166', 5.0, '3:09', 'Houston, Texas , United States']
SQL:

assistant: SELECT COUNT("Round") FROM "Table" WHERE "Time" = '5:00' AND "Event" = 'ufc 155';