Question: Which stadium is for Football with the China League One?
SQL: SELECT "Stadium" FROM "2-12537-3" WHERE "Sport" = 'Football' AND "League" = 'China League One';

Question: Which tier is for Football at Tianhe Stadium?
SQL: SELECT "Tier" FROM "2-12537-3" WHERE "Sport" = 'Football' AND "Stadium" = 'Tianhe Stadium';