Who was the GT2 winning team when the GT3 winning team was #1 PTG?
CREATE TABLE "table1_11875915_2" (
  "rnd" real,
  "circuit" text,
  "wsc_winning_team" text,
  "gt1_winning_team" text,
  "gt2_winning_team" text,
  "gt3_winning_team" text,
  "results" text
);
SELECT "gt2_winning_team" FROM "table1_11875915_2" WHERE "gt3_winning_team"='#1 PTG';