user: Question: At the UFC 78, what is the average round when the time is 5:00?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Win', '16–4–1', 'Charles Oliveira', 'Decision (unanimous)', 'UFC 162', 3.0, '5:00', 'Las Vegas, Nevada , United States']
SQL:

assistant: SELECT AVG("Round") FROM "Table" WHERE "Time" = '5:00' AND "Event" = 'UFC 78';