Table: race_results
Columns: rnd
circuit
wsc_winning_team
gt1_winning_team
gt2_winning_team
gt3_winning_team
results

Question: Who was the GT2 winning team when the GT3 winning team was #1 PTG?
SQL: SELECT "gt2_winning_team" FROM race_results WHERE "gt3_winning_team" = '#1 PTG'