Who was the challenger when winner was kimio nonaga?
CREATE TABLE "2000_2002_specials" (
  "special" text,
  "original_airdate" text,
  "iron_chef" text,
  "challenger" text,
  "challenger_specialty" text,
  "theme_ingredient" text,
  "winner" text
);
SELECT "challenger" FROM "2000_2002_specials" WHERE "winner"='Kimio Nonaga';