Find the race of the superhero who weighs 108kg and is 188cm tall.
weighs 108kg refers to weight_kg = 108; 188cm tall refers to height_cm = 188;
SELECT DISTINCT T2.race FROM superhero AS T1 INNER JOIN race AS T2 ON T1.race_id = T2.id WHERE T1.weight_kg = 108 AND T1.height_cm = 188