What is lead for the Election Results polling firm and has a PSOE of 39.6% 175?
CREATE TABLE "176_seats_needed_for_a_majority" (
  "polling_firm" text,
  "date" text,
  "link" text,
  "psoe" text,
  "others" text,
  "lead" text
);
SELECT "lead" FROM "176_seats_needed_for_a_majority" WHERE "polling_firm"='election results' AND "psoe"='39.6% 175';