user: Question: Who was the on the cover when Bob Vila did the 20 Questions?
Columns: ['Date', 'Cover model', 'Centerfold model', 'Interview subject', '20 Questions', 'Pictorials']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1-87', 'no model pictured', 'Luann Lee', 'Don Johnson', 'John Fogerty', 'Jane Seymour , Elisa Florez']
SQL:

assistant: SELECT "Cover model" FROM "Table" WHERE "20 Questions" = 'Bob Vila';