user: Question: What is lead for the Election results polling firm and has a PSOE of 39.6% 175?
Columns: ['Polling Firm', 'Date', 'Link', 'PSOE', 'Others', 'Lead']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Election results', 'October 29, 1989', 'HTML', '39.6% 175', '12.6% 19', '13.8%']
SQL:

assistant: SELECT "Lead" FROM "Table" WHERE "Polling Firm" = 'Election results' AND "PSOE" = '39.6% 175';