Which Conference Semifinals has a Record of 55–27?
CREATE TABLE "playoffs" (
  "season" text,
  "record" text,
  "seed" text,
  "first_round" text,
  "conference_semifinals" text,
  "conference_finals" text,
  "nba_finals" text
);
SELECT "conference_semifinals" FROM "playoffs" WHERE "record"='55–27';