user: Question: Who played 20 questions during the issue in which Pamela Horton is on the cover?
Columns: ['Date', 'Cover model', 'Centerfold model', 'Interview subject', '20 Questions', 'Pictorials']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1 / 2 2012 Double Issue', 'Lindsay Lohan', 'Jan. Heather Knox and Feb. Leola Bell', 'Chris Wallace', 'Nick Offerman', 'Lindsay Lohan , Playmate Review']
SQL:

assistant: SELECT "20 Questions" FROM "Table" WHERE "Cover model" = 'Pamela Horton';