user: Question: What is the round for the UFC on Fox: Velasquez vs. Dos Santos event?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '17-6', 'Mikhail Zayats', 'Submission (kimura)', 'Bellator 103', 1.0, '0:47', 'Mulvane, Kansas , United States']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Event" = 'UFC on Fox: Velasquez vs. Dos Santos';