CREATE TABLE table_5912 ("Race Name" TEXT, "Circuit" TEXT, "City/Location" TEXT, "Date" TEXT, "Pole position" TEXT, "Fastest lap" TEXT, "Winning driver" TEXT, "Winning team" TEXT, "Report" TEXT)

Which circuit did Michael Andretti win?
SELECT "Circuit" FROM table_5912 WHERE "Winning driver" = 'michael andretti'
SELECT "Circuit" FROM "table_5912" WHERE "Winning driver" = 'michael andretti'