user: Question: What is the Source with a Norris that is 7%?
Columns: ['Date', 'Source', 'Polling Agency', 'Davis', 'Gallagher', 'Higgins', 'McGuinness', 'Mitchell', 'Norris', 'Scallon']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['25 September 2011', 'The Sunday Business Post', 'RED C', '13%', '11%', '18%', '16%', '13%', '21%', '6%']
SQL:

assistant: SELECT "Source" FROM "Table" WHERE "Norris" = '7%';