user: Question: What internet explorer has 1.67% as the opera, with 2012 Q1 as the period?
Columns: ['Period', 'Internet Explorer', 'Firefox', 'Chrome', 'Safari', 'Opera', 'Other']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2013 Q1', '55.58%', '20.09%', '16.76%', '5.32%', '1.77%', '0.48%']
SQL:

assistant: SELECT "Internet Explorer" FROM "Table" WHERE "Opera" = '1.67%' AND "Period" = '2012 Q1';