CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "round" real,
  "time" text,
  "location" text
);

Question: Who is the opponent of the submission (triangle choke) method of submission?
SQL: SELECT "opponent" FROM "mixed_martial_arts_record" WHERE "method"='submission (triangle choke)';